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/packaging/os/apt.py

@@ -212,7 +212,7 @@ cache_updated:
 cache_update_time:
     description: time of the last cache update (0 if unknown)
     returned: success, in some cases
-    type: datetime
+    type: int
     sample: 1425828348000
 stdout:
     description: output from apt

lib/ansible/modules/packaging/os/pacman.py

@@ -96,7 +96,7 @@ RETURN = '''
 packages:
     description: a list of packages that have been changed
     returned: when upgrade is set to yes
-    type: list of strings
+    type: list
     sample: ['package', 'other-package']
 '''
 

lib/ansible/modules/packaging/os/xbps.py

@@ -94,6 +94,7 @@ packages:
     description: Packages that are affected/would be affected
     type: list
     sample: ["ansible"]
+    returned: success
 '''