chore(helm): use empty/nil storageClass for helm-docs (#3245)

i believe that `nil` would be false in the if :
```yaml
storageClass:
```
is still handled correct.

---
In past ( #3191 ), will have the problem with an empty string `""`:
```yaml
storageClass: ""
```

---
do you take another look @S7evinK ?

Signed-off-by: WrenIX <dev.github@wrenix.eu>

helm/dendrite/README.md

@@ -1,7 +1,7 @@
 
 # dendrite
 
-![Version: 0.13.7](https://img.shields.io/badge/Version-0.13.7-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: 0.13.6](https://img.shields.io/badge/AppVersion-0.13.6-informational?style=flat-square)
+![Version: 0.13.8](https://img.shields.io/badge/Version-0.13.8-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: 0.13.6](https://img.shields.io/badge/AppVersion-0.13.6-informational?style=flat-square)
 Dendrite Matrix Homeserver
 
 Status: **NOT PRODUCTION READY**
@@ -48,13 +48,16 @@ Create a folder `appservices` and place your configurations in there.  The confi
 | signing_key.create | bool | `true` | Create a new signing key, if not exists |
 | signing_key.existingSecret | string | `""` | Use an existing secret |
 | resources | object | sets some sane default values | Default resource requests/limits. |
-| persistence.jetstream | object | `{"capacity":"1Gi","existingClaim":""}` | The storage class to use for volume claims. Used unless specified at the specific component. Defaults to the cluster default storage class. # If defined, storageClassName: <storageClass> # If set to "-", storageClassName: "", which disables dynamic provisioning # If undefined (the default) or set to null, no storageClassName spec is #   set, choosing the default provisioner.  (gp2 on AWS, standard on #   GKE, AWS & OpenStack) # storageClass: "" |
+| persistence.storageClass | string | `nil` | The storage class to use for volume claims. Used unless specified at the specific component. Defaults to the cluster default storage class. If defined, storageClassName: <storageClass> If set to "-", storageClassName: "", which disables dynamic provisioning If undefined (the default) or set to null, no storageClassName spec is   set, choosing the default provisioner.  (gp2 on AWS, standard on   GKE, AWS & OpenStack)  |
 | persistence.jetstream.existingClaim | string | `""` | Use an existing volume claim for jetstream |
 | persistence.jetstream.capacity | string | `"1Gi"` | PVC Storage Request for the jetstream volume |
+| persistence.jetstream.storageClass | string | `nil` | The storage class to use for volume claims. Defaults to persistence.storageClass If defined, storageClassName: <storageClass> If set to "-", storageClassName: "", which disables dynamic provisioning If undefined (the default) or set to null, no storageClassName spec is   set, choosing the default provisioner.  (gp2 on AWS, standard on   GKE, AWS & OpenStack) |
 | persistence.media.existingClaim | string | `""` | Use an existing volume claim for media files |
 | persistence.media.capacity | string | `"1Gi"` | PVC Storage Request for the media volume |
+| persistence.media.storageClass | string | `nil` | The storage class to use for volume claims. Defaults to persistence.storageClass If defined, storageClassName: <storageClass> If set to "-", storageClassName: "", which disables dynamic provisioning If undefined (the default) or set to null, no storageClassName spec is   set, choosing the default provisioner.  (gp2 on AWS, standard on   GKE, AWS & OpenStack) |
 | persistence.search.existingClaim | string | `""` | Use an existing volume claim for the fulltext search index |
 | persistence.search.capacity | string | `"1Gi"` | PVC Storage Request for the search volume |
+| persistence.search.storageClass | string | `nil` | The storage class to use for volume claims. Defaults to persistence.storageClass If defined, storageClassName: <storageClass> If set to "-", storageClassName: "", which disables dynamic provisioning If undefined (the default) or set to null, no storageClassName spec is   set, choosing the default provisioner.  (gp2 on AWS, standard on   GKE, AWS & OpenStack) |
 | extraVolumes | list | `[]` | Add additional volumes to the Dendrite Pod |
 | extraVolumeMounts | list | `[]` | Configure additional mount points volumes in the Dendrite Pod |
 | strategy.type | string | `"RollingUpdate"` | Strategy to use for rolling updates (e.g. Recreate, RollingUpdate) If you are using ReadWriteOnce volumes, you should probably use Recreate |

helm/dendrite/values.yaml

@@ -26,55 +26,52 @@ persistence:
   # -- The storage class to use for volume claims.
   # Used unless specified at the specific component.
   # Defaults to the cluster default storage class.
-  ## If defined, storageClassName: <storageClass>
-  ## If set to "-", storageClassName: "", which disables dynamic provisioning
-  ## If undefined (the default) or set to null, no storageClassName spec is
-  ##   set, choosing the default provisioner.  (gp2 on AWS, standard on
-  ##   GKE, AWS & OpenStack)
-  ##
-  # storageClass: ""
+  # If defined, storageClassName: <storageClass>
+  # If set to "-", storageClassName: "", which disables dynamic provisioning
+  # If undefined (the default) or set to null, no storageClassName spec is
+  #   set, choosing the default provisioner.  (gp2 on AWS, standard on
+  #   GKE, AWS & OpenStack)
+  #
+  storageClass:
   jetstream:
     # -- Use an existing volume claim for jetstream
     existingClaim: ""
     # -- PVC Storage Request for the jetstream volume
     capacity: "1Gi"
     # -- The storage class to use for volume claims.
     # Defaults to persistence.storageClass
-    ## If defined, storageClassName: <storageClass>
-    ## If set to "-", storageClassName: "", which disables dynamic provisioning
-    ## If undefined (the default) or set to null, no storageClassName spec is
-    ##   set, choosing the default provisioner.  (gp2 on AWS, standard on
-    ##   GKE, AWS & OpenStack)
-    ##
-    # storageClass: ""
+    # If defined, storageClassName: <storageClass>
+    # If set to "-", storageClassName: "", which disables dynamic provisioning
+    # If undefined (the default) or set to null, no storageClassName spec is
+    #   set, choosing the default provisioner.  (gp2 on AWS, standard on
+    #   GKE, AWS & OpenStack)
+    storageClass:
   media:
     # -- Use an existing volume claim for media files
     existingClaim: ""
     # -- PVC Storage Request for the media volume
     capacity: "1Gi"
     # -- The storage class to use for volume claims.
     # Defaults to persistence.storageClass
-    ## If defined, storageClassName: <storageClass>
-    ## If set to "-", storageClassName: "", which disables dynamic provisioning
-    ## If undefined (the default) or set to null, no storageClassName spec is
-    ##   set, choosing the default provisioner.  (gp2 on AWS, standard on
-    ##   GKE, AWS & OpenStack)
-    ##
-    # storageClass: ""
+    # If defined, storageClassName: <storageClass>
+    # If set to "-", storageClassName: "", which disables dynamic provisioning
+    # If undefined (the default) or set to null, no storageClassName spec is
+    #   set, choosing the default provisioner.  (gp2 on AWS, standard on
+    #   GKE, AWS & OpenStack)
+    storageClass:
   search:
     # -- Use an existing volume claim for the fulltext search index
     existingClaim: ""
     # -- PVC Storage Request for the search volume
     capacity: "1Gi"
     # -- The storage class to use for volume claims.
     # Defaults to persistence.storageClass
-    ## If defined, storageClassName: <storageClass>
-    ## If set to "-", storageClassName: "", which disables dynamic provisioning
-    ## If undefined (the default) or set to null, no storageClassName spec is
-    ##   set, choosing the default provisioner.  (gp2 on AWS, standard on
-    ##   GKE, AWS & OpenStack)
-    ##
-    # storageClass: ""
+    # If defined, storageClassName: <storageClass>
+    # If set to "-", storageClassName: "", which disables dynamic provisioning
+    # If undefined (the default) or set to null, no storageClassName spec is
+    #   set, choosing the default provisioner.  (gp2 on AWS, standard on
+    #   GKE, AWS & OpenStack)
+    storageClass:
 
 # -- Add additional volumes to the Dendrite Pod
 extraVolumes: []