docs: added attributes metadata for check_mode support (fixes #643)

changelogs/fragments/643-sysctl-docs.yml

@@ -0,0 +1,3 @@
+---
+trivial:
+  - sysctl - added the attributes section to the module documentation to reflect check_mode support (https://github.com/ansible-collections/ansible.posix/issues/643).

plugins/modules/sysctl.py

@@ -56,6 +56,17 @@ options:
             - Verify token value with the sysctl command and set with C(-w) if necessary.
         type: bool
         default: false
+attributes:
+  check_mode:
+    support: full
+    description: Can run in check_mode and return changed status prediction without modifying target.
+  diff_mode:
+    support: none
+    description: Does not support differences output.
+  platform:
+    platforms: posix
+    support: full
+    description: Supported on POSIX-compliant systems.
 author:
 - David CHANIAL (@davixx)
 '''