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_container.py

@@ -18,7 +18,6 @@ description:
   - Manage the life cycle of Docker containers.
   - Supports check mode. Run with C(--check) and C(--diff) to view config difference and list of actions to be taken.
 
-
 notes:
   - For most config changes, the container needs to be recreated. This means that the existing container has to be destroyed and
     a new one created. This can cause unexpected data loss and downtime. You can use the I(comparisons) option to
@@ -27,6 +26,20 @@ notes:
     new container (except I(image)). Therefore, always specify B(all) options relevant to the container.
   - When I(restart) is set to C(true), the module will only restart the container if no config changes are detected.
 
+extends_documentation_fragment:
+  - community.docker.docker
+  - community.docker.docker.docker_py_1_documentation
+  - community.docker.attributes
+  - community.docker.attributes.actiongroup_docker
+
+attributes:
+  check_mode:
+    support: partial
+    details:
+      - When trying to pull an image, the module assumes this is always changed in check mode.
+  diff_mode:
+    support: full
+
 options:
   auto_remove:
     description:
@@ -929,10 +942,6 @@ options:
     description:
       - Path to the working directory.
     type: str
-extends_documentation_fragment:
-- community.docker.docker
-- community.docker.docker.docker_py_1_documentation
-
 
 author:
   - "Cove Schneider (@cove)"