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_taboo_contract.py

@@ -43,9 +43,8 @@ options:
   scope:
     description:
     - The scope of a service contract.
-    - The APIC defaults new Taboo Contracts to C(context).
+    - The APIC defaults to C(context) when unset during creation.
     choices: [ application-profile, context, global, tenant ]
-    default: context
   state:
     description:
     - Use C(present) or C(absent) for adding or removing.
@@ -208,8 +207,6 @@ def main():
         scope=dict(type='str', choices=['application-profile', 'context', 'global', 'tenant']),
         description=dict(type='str', aliases=['descr']),
         state=dict(type='str', default='present', choices=['absent', 'present', 'query']),
-        method=dict(type='str', choices=['delete', 'get', 'post'], aliases=['action'], removed_in_version='2.6'),  # Deprecated starting from v2.6
-        protocol=dict(type='str', removed_in_version='2.6'),  # Deprecated in v2.6
     )
 
     module = AnsibleModule(