Book typo fixes

A few typos or misformattings in the book existed.  This fixes them.

Author: DirectXMan12

docs/book/src/cronjob-tutorial/epilogue.md

@@ -3,5 +3,4 @@
 Things left to do:
 
 - Write custom printer columns
-- Discuss webhooks
 - Use different watches

docs/book/src/cronjob-tutorial/testdata/emptycontroller.go

@@ -44,9 +44,10 @@ type CronJobReconciler struct {
 }
 
 /*
-Most controllers eventually end up running on the cluster, so they need RBAC permissions.
-These are the bare minimum permissions needed to run.  As we add more functionality, we'll
-need to revisit these.
+Most controllers eventually end up running on the cluster, so they need RBAC
+permissions, which we specify using controller-tools [RBAC
+markers](/reference/markers/rbac.md).  These are the bare minimum permissions
+needed to run.  As we add more functionality, we'll need to revisit these.
 */
 
 // +kubebuilder:rbac:groups=batch.tutorial.kubebuilder.io,resources=cronjobs,verbs=get;list;watch;create;update;patch;delete

docs/book/src/cronjob-tutorial/testdata/project/controllers/cronjob_controller.go

@@ -87,7 +87,8 @@ func ignoreNotFound(err error) error {
 
 /*
 Notice that we need a few more RBAC permissions -- since we're creating and
-managing jobs now, we'll need permissions for those.
+managing jobs now, we'll need permissions for those, which means adding
+a couple more [markers](/reference/markers/rbac.md).
 */
 
 // +kubebuilder:rbac:groups=batch.tutorial.kubebuilder.io,resources=cronjobs,verbs=get;list;watch;create;update;patch;delete

docs/book/src/multiversion-tutorial/deployment.md

@@ -34,7 +34,7 @@ kubectl get disks.v2.infra.kubebuilder.io/disk-sample -o yaml
 ```
 
 ```yaml
-apiVersion: infra.kubebuilder.io/v2 <-- note the v2 version
+apiVersion: infra.kubebuilder.io/v2 # <-- note the v2 version
 kind: Disk
 metadata:
   name: disk-sample
@@ -54,15 +54,15 @@ status: {}
 kubectl get disks.v3.infra.kubebuilder.io/disk-sample -o yaml
 ```
 ```yaml
-apiVersion: infra.kubebuilder.io/v3 <-- note the v3 version
+apiVersion: infra.kubebuilder.io/v3 # <-- note the v3 version
 kind: Disk
 metadata:
   name: disk-sample
   selfLink: /apis/infra.kubebuilder.io/v3/namespaces/default/disks/disk-sample
   uid: 0e9be0fd-a284-11e9-bbbe-42010a8001af <-- note the same uid as v2
   ....
 spec:
-  pricePerGB: <-- note the pricePerGB name of the field
+  pricePerGB: # <-- note the pricePerGB name of the field
     amount: 10
     currency: USD
 status: {}