Clean up module documentation (#36909)

* Clean up module documentation

This PR includes:
- Removal of `default: None` (and variations)
- Removal of `required: false`
- Fixing booleans and `type: bool` where required

* Fix remaining (new) validation issues

lib/ansible/modules/network/enos/enos_config.py

@@ -47,8 +47,6 @@ options:
         in the device running-config.  Be sure to note the configuration
         command syntax as some commands are automatically modified by the
         device config parser.
-    required: false
-    default: null
     aliases: ['commands']
   parents:
     description:
@@ -56,8 +54,6 @@ options:
         the commands should be checked against.  If the parents argument
         is omitted, the commands are checked against the set of top
         level or global commands.
-    required: false
-    default: null
   src:
     description:
       - Specifies the source path to the file that contains the configuration
@@ -65,8 +61,6 @@ options:
         either be the full path on the Ansible control host or a relative
         path from the playbook or role root directory.  This argument is
         mutually exclusive with I(lines), I(parents).
-    required: false
-    default: null
   before:
     description:
       - The ordered set of commands to push on to the command stack if
@@ -74,16 +68,12 @@ options:
         the opportunity to perform configuration commands prior to pushing
         any changes without affecting how the set of commands are matched
         against the system.
-    required: false
-    default: null
   after:
     description:
       - The ordered set of commands to append to the end of the command
         stack if a change needs to be made.  Just like with I(before) this
         allows the playbook designer to append a set of commands to be
         executed after the command set.
-    required: false
-    default: null
   match:
     description:
       - Instructs the module on the way to perform the matching of
@@ -94,7 +84,6 @@ options:
         must be an equal match.  Finally, if match is set to I(none), the
         module will not attempt to compare the source configuration with
         the running configuration on the remote device.
-    required: false
     default: line
     choices: ['line', 'strict', 'exact', 'none']
   replace:
@@ -105,7 +94,6 @@ options:
         mode.  If the replace argument is set to I(block) then the entire
         command block is pushed to the device in configuration mode if any
         line is not correct.
-    required: false
     default: line
     choices: ['line', 'block', 'config']
   config:
@@ -117,8 +105,6 @@ options:
         every task in a playbook.  The I(config) argument allows the
         implementer to pass in the configuration to use as the base
         config for comparison.
-    required: false
-    default: null
   backup:
     description:
       - This argument will cause the module to create a full backup of
@@ -126,23 +112,20 @@ options:
         changes are made.  The backup file is written to the C(backup)
         folder in the playbook root directory.  If the directory does not
         exist, it is created.
-    required: false
-    default: no
-    choices: ['yes', 'no']
+    type: bool
+    default: 'no'
   comment:
     description:
       - Allows a commit description to be specified to be included
         when the configuration is committed.  If the configuration is
         not changed or committed, this argument is ignored.
-    required: false
     default: 'configured by enos_config'
   admin:
     description:
       - Enters into administration configuration mode for making config
         changes to the device.
-    required: false
-    default: false
-    choices: [ "yes", "no" ]
+    type: bool
+    default: 'no'
 """
 
 EXAMPLES = """