Document attributes (#497)

* Add 'docker' action group attribute.

* Compatibility with older ansible-core releases.

* Fix typo.

* Docment standard attributes.

* Improve docs.

* Add shortcuts for common combinations.

plugins/modules/docker_volume.py

@@ -15,6 +15,18 @@ short_description: Manage Docker volumes
 description:
   - Create/remove Docker volumes.
   - Performs largely the same function as the C(docker volume) CLI subcommand.
+
+extends_documentation_fragment:
+  - community.docker.docker.api_documentation
+  - community.docker.attributes
+  - community.docker.attributes.actiongroup_docker
+
+attributes:
+  check_mode:
+    support: full
+  diff_mode:
+    support: full
+
 options:
   volume_name:
     description:
@@ -69,10 +81,6 @@ options:
       - absent
       - present
 
-extends_documentation_fragment:
-- community.docker.docker.api_documentation
-
-
 author:
   - Alex Grönholm (@agronholm)