Add plugins to ansible-doc test and fix issues.

lib/ansible/plugins/callback/null.py

@@ -6,7 +6,7 @@ from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
 DOCUMENTATION = '''
-    callback: null
+    callback: 'null'
     callback_type: stdout
     requirements:
       - set as main display callback

lib/ansible/plugins/lookup/_redis_kv.py

@@ -11,7 +11,7 @@ DOCUMENTATION = """
     short_description: fetch data from Redis
     deprecated:
         why: This lookup uses options intermingled with terms which blurs the interface between settings and data
-        version: '2.9'
+        removed_in: '2.9'
         alternative: new 'redis' lookup
     description:
       - this lookup returns a list of items given to it, if any of the top level items is also a list it will flatten it, but it will not recurse

lib/ansible/plugins/lookup/cyberarkpassword.py

@@ -11,6 +11,7 @@ DOCUMENTATION = """
     requirements:
       - CyberArk AIM tool installed
     description:
+      - Get secrets from CyberArk AIM.
     options :
       _command:
         description: Cyberark CLI utility.

lib/ansible/plugins/lookup/shelvefile.py

@@ -10,6 +10,7 @@ DOCUMENTATION = """
     version_added: "2.0"
     short_description: read keys from Python shelve file
     description:
+      - Read keys from Python shelve file.
     optoins:
       _terms:
         description: sets of key value pairs of parameters