docs: fix linter warnings

Author: josecelano

docs/containers.md

@@ -1,10 +1,10 @@
 # Containers (Docker or Podman)
 
 ## Demo environment
+
 It is simple to setup the index with the default
 configuration and run it using the pre-built public docker image:
 
-
 With Docker:
 
 ```sh
@@ -17,11 +17,12 @@ or with Podman:
 podman run -it torrust/index:latest
 ```
 
-
 ## Requirements
+
 - Tested with recent versions of Docker or Podman.
 
 ## Volumes
+
 The [Containerfile](../Containerfile) (i.e. the Dockerfile) Defines Three Volumes:
 
 ```Dockerfile
@@ -38,19 +39,22 @@ When instancing the container image with the `docker run` or `podman run` comman
 
 > NOTE: You can adjust this mapping for your preference, however this mapping is the default in our guides and scripts.
 
-### Pre-Create Host-Mapped Folders:
+### Pre-Create Host-Mapped Folders
+
 Please run this command where you wish to run the container:
 
 ```sh
 mkdir -p ./storage/index/lib/ ./storage/index/log/ ./storage/index/etc/
 ```
 
 ### Matching Ownership ID's of Host Storage and Container Volumes
+
 It is important that the `torrust` user has the same uid `$(id -u)` as the host mapped folders. In our [entry script](../share/container/entry_script_sh), installed to `/usr/local/bin/entry.sh` inside the container, switches to the `torrust` user created based upon the `USER_UID` environmental variable.
 
 When running the container, you may use the `--env USER_ID="$(id -u)"` argument that gets the current user-id and passes to the container.
 
 ### Mapped Tree Structure
+
 Using the standard mapping defined above produces this following mapped tree:
 
 ```s
@@ -78,6 +82,7 @@ git clone https://github.com/torrust/torrust-index.git; cd torrust-index
 ```
 
 ### (Docker) Setup Context
+
 Before starting, if you are using docker, it is helpful to reset the context to the default:
 
 ```sh
@@ -107,6 +112,7 @@ podman build --target debug --tag torrust-index:debug --file Containerfile .
 ## Running the Container
 
 ### Basic Run
+
 No arguments are needed for simply checking the container image works:
 
 #### (Docker) Run Basic
@@ -118,6 +124,7 @@ docker run -it torrust-index:release
 # Debug Mode
 docker run -it torrust-index:debug
 ```
+
 #### (Podman) Run Basic
 
 ```sh
@@ -129,11 +136,13 @@ podman run -it torrust-index:debug
 ```
 
 ### Arguments
+
 The arguments need to be placed before the image tag. i.e.
 
 `run [arguments] torrust-index:release`
 
 #### Environmental Variables:
+
 Environmental variables are loaded through the `--env`, in the format `--env VAR="value"`.
 
 The following environmental variables can be set:
@@ -145,8 +154,8 @@ The following environmental variables can be set:
 - `USER_ID` - The user id for the runtime crated `torrust` user. Please Note: This user id should match the ownership of the host-mapped volumes, (default `1000`).
 - `API_PORT` - The port for the index API. This should match the port used in the configuration, (default `3001`).
 
-
 ### Sockets
+
 Socket ports used internally within the container can be mapped to with the `--publish` argument.
 
 The format is: `--publish [optional_host_ip]:[host_port]:[container_port]/[optional_protocol]`, for example: `--publish 127.0.0.1:8080:80/tcp`.
@@ -159,8 +168,9 @@ The default ports can be mapped with the following:
 
 > NOTE: Inside the container it is necessary to expose a socket with the wildcard address `0.0.0.0` so that it may be accessible from the host. Verify that the configuration that the sockets are wildcard.
 
-### Volumes
-By default the container will use install volumes for `/var/lib/torrust/index`, `/var/log/torrust/index`, and `/etc/torrust/index`, however for better administration it good to make these volumes host-mapped.
+### Mapped Volumes
+
+By default the container will install volumes for `/var/lib/torrust/index`, `/var/log/torrust/index`, and `/etc/torrust/index`, however for better administration it good to make these volumes host-mapped.
 
 The argument to host-map volumes is `--volume`, with the format: `--volume=[host-src:]container-dest[:<options>]`.
 
@@ -172,10 +182,9 @@ The default mapping can be supplied with the following arguments:
 --volume ./storage/index/etc:/etc/torrust/index:Z \
 ```
 
-
 Please not the `:Z` at the end of the podman `--volume` mapping arguments, this is to give read-write permission on SELinux enabled systemd, if this doesn't work on your system, you can use `:rw` instead.
 
-## Complete Example:
+## Complete Example
 
 ### With Docker