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/net_tools/dnsimple.py

@@ -24,73 +24,52 @@ options:
       - >
         Account email. If omitted, the env variables DNSIMPLE_EMAIL and DNSIMPLE_API_TOKEN will be looked for.
         If those aren't found, a C(.dnsimple) file will be looked for, see: U(https://github.com/mikemaccana/dnsimple-python#getting-started)
-    required: false
-    default: null
 
   account_api_token:
     description:
       - Account API token. See I(account_email) for info.
-    required: false
-    default: null
 
   domain:
     description:
       - Domain to work with. Can be the domain name (e.g. "mydomain.com") or the numeric ID of the domain in DNSimple. If omitted, a list of domains
         will be returned.
       - If domain is present but the domain doesn't exist, it will be created.
-    required: false
-    default: null
 
   record:
     description:
       - Record to add, if blank a record for the domain will be created, supports the wildcard (*)
-    required: false
-    default: null
 
   record_ids:
     description:
       - List of records to ensure they either exist or don't exist
-    required: false
-    default: null
 
   type:
     description:
       - The type of DNS record to create
-    required: false
     choices: [ 'A', 'ALIAS', 'CNAME', 'MX', 'SPF', 'URL', 'TXT', 'NS', 'SRV', 'NAPTR', 'PTR', 'AAAA', 'SSHFP', 'HINFO', 'POOL' ]
-    default: null
 
   ttl:
     description:
       - The TTL to give the new record
-    required: false
     default: 3600 (one hour)
 
   value:
     description:
       - Record value
       - "Must be specified when trying to ensure a record exists"
-    required: false
-    default: null
 
   priority:
     description:
       - Record priority
-    required: false
-    default: null
 
   state:
     description:
       - whether the record should exist or not
-    required: false
     choices: [ 'present', 'absent' ]
-    default: null
 
   solo:
     description:
       - Whether the record should be the only one for that record type and record name. Only use with state=present on a record
-    required: false
-    default: null
 
 requirements: [ dnsimple ]
 author: "Alex Coomans (@drcapulet)"