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/packaging/language/bower.py

@@ -25,19 +25,16 @@ options:
   name:
     description:
       - The name of a bower package to install
-    required: false
   offline:
     description:
       - Install packages from local cache, if the packages were installed before
-    required: false
-    default: no
-    choices: [ "yes", "no" ]
+    type: bool
+    default: 'no'
   production:
     description:
       - Install with --production flag
-    required: false
-    default: no
-    choices: [ "yes", "no" ]
+    type: bool
+    default: 'no'
     version_added: "2.0"
   path:
     description:
@@ -46,19 +43,15 @@ options:
   relative_execpath:
     description:
       - Relative path to bower executable from install path
-    default: null
-    required: false
     version_added: "2.1"
   state:
     description:
       - The state of the bower package
-    required: false
     default: present
     choices: [ "present", "absent", "latest" ]
   version:
     description:
       - The version to be installed
-    required: false
 '''
 
 EXAMPLES = '''