fixed RETURN docs for modules (#24011)

* fixed RETURN docs for remaining modules

* updated proxymysql_mysql_users 'sample' to yaml dict

* fixed whitespace errors

lib/ansible/modules/web_infrastructure/ansible_tower/tower_job_list.py

@@ -66,7 +66,7 @@ count:
     description: Total count of objects return
     returned: success
     type: int
-    sampled: 51
+    sample: 51
 next:
     description: next page available for the listing
     returned: success

lib/ansible/modules/web_infrastructure/ansible_tower/tower_job_wait.py

@@ -76,12 +76,12 @@ started:
     description: timestamp of when the job started running
     returned: success
     type: string
-    sample: 2017-03-01T17:03:53.200234Z
+    sample: "2017-03-01T17:03:53.200234Z"
 finished:
     description: timestamp of when the job finished running
     returned: success
     type: string
-    sample: 2017-03-01T17:04:04.078782Z
+    sample: "2017-03-01T17:04:04.078782Z"
 status:
     description: current status of job
     returned: success

lib/ansible/modules/web_infrastructure/letsencrypt.py

@@ -137,11 +137,12 @@ RETURN = '''
 cert_days:
   description: the number of days the certificate remains valid.
   returned: success
+  type: int
 challenge_data:
   description: per domain / challenge type challenge data
   returned: changed
   type: dictionary
-  contains:
+  sample:
     resource:
       description: the challenge resource that must be created for validation
       returned: changed
@@ -156,7 +157,7 @@ authorizations:
   description: ACME authorization data.
   returned: changed
   type: list
-  contains:
+  sample:
       authorization:
         description: ACME authorization object. See https://tools.ietf.org/html/draft-ietf-acme-acme-02#section-6.1.2
         returned: success