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/iosxr/iosxr_command.py

@@ -45,8 +45,6 @@ options:
         before moving forward. If the conditional is not true
         within the configured number of retries, the task fails.
         See examples.
-    required: false
-    default: null
     aliases: ['waitfor']
     version_added: "2.2"
   match:
@@ -57,7 +55,6 @@ options:
         then all conditionals in the wait_for must be satisfied.  If
         the value is set to C(any) then only one of the values must be
         satisfied.
-    required: false
     default: all
     choices: ['any', 'all']
     version_added: "2.2"
@@ -67,7 +64,6 @@ options:
         before it is considered failed. The command is run on the
         target device every retry and evaluated against the
         I(wait_for) conditions.
-    required: false
     default: 10
   interval:
     description:
@@ -75,7 +71,6 @@ options:
         of the command. If the command does not pass the specified
         conditions, the interval indicates how long to wait before
         trying the command again.
-    required: false
     default: 1
 """