container: add missing CLI command definitions

(cherry picked from commit 3bac18ee5271e5af0ee6a200e0a04b8c6bfe07bd)

docs/configuration/container/index.rst

@@ -132,15 +132,46 @@ Configuration
 
    Disable a container.
 
-.. cfgcmd:: set container network <networkname>
+Container Networks
+==================
+
+.. cfgcmd:: set container network <name>
 
     Creates a named container network
 
+.. cfgcmd:: set container network <name> description
+
+    A brief description what this network is all about.
+
+.. cfgcmd:: set container network <name> prefix <ipv4|ipv6>
+
+    Define IPv4 or IPv6 prefix for a given network name. Only one IPv4 and
+    one IPv6 prefix can be used per network name.
+
+.. cfgcmd:: set container network <name> vrf <nme>
+
+    Bind container network to a given VRF instance.
+
+Container Registry
+==================
+
 .. cfgcmd:: set container registry <name>
 
     Adds registry to list of unqualified-search-registries. By default, for any
-    image that does not include the registry in the image name, Vyos will use 
-    docker.io as the container registry.
+    image that does not include the registry in the image name, VyOS will use
+    docker.io and quay.io as the container registry.
+
+.. cfgcmd:: set container registry <name> disable
+
+    Disable a given container registry
+
+.. cfgcmd:: set container registry <name> authentication username
+.. cfgcmd:: set container registry <name> authentication password
+
+    Some container registries require credentials to be used.
+
+    Credentials can be defined here and will only be used when adding a
+    container image to the system.
 
 
 ******************
@@ -175,7 +206,10 @@ Operation Commands
 
     Update container image
 
+.. opcmd:: delete container image [image id|all]
 
+    Delete a particular container image based on it's image ID.
+    You can also delete all container images at once.
 
 *********************
 Example Configuration