Remove duplicate keys from module docs. (#4920)

cloud/digital_ocean/digital_ocean_block_storage.py

@@ -26,7 +26,6 @@ short_description: Create/destroy or attach/detach Block Storage volumes in Digi
 description:
      - Create/destroy Block Storage volume in DigitalOcean, or attach/detach Block Storage volume to a droplet. 
 version_added: "2.2"
-author: "Harnek Sidhu"
 options:
   command:
     description:

network/junos/junos_config.py

@@ -112,7 +112,6 @@ options:
         the equivalent, set the I(update) argument to C(replace).  This argument
         will be removed in a future release.
     required: false
-    required: true
     choices: ['yes', 'no']
     default: false
   backup:

network/nxos/nxos_acl.py

@@ -95,7 +95,6 @@ options:
               keyword 'any'.
         required: false
         default: null
-        default: null
     dest_port_op:
         description:
             - Destination port operands such as eq, neq, gt, lt, range.