Fix module validation checks and remove old params (#39926)

This PR includes:
- Fixes to the majority of module validation issues
  (deliberate inconsistencies between docs and arg_spec)
- Removal of deprecated parameters 'method' and 'protocols'
- A few typos in the documentation

There are still some left-over validation errors, some are deliberate
(like doc strings as default to indicate ranges, etc.)

lib/ansible/modules/network/aci/aci_rest.py

@@ -320,7 +320,6 @@ def main():
         method=dict(type='str', default='get', choices=['delete', 'get', 'post'], aliases=['action']),
         src=dict(type='path', aliases=['config_file']),
         content=dict(type='raw'),
-        protocol=dict(type='str', removed_in_version='2.6'),  # Deprecated in v2.6
     )
 
     module = AnsibleModule(