[PR #11055/a9a4f890 backport][stable-12] remove required=false from docs (#11065)

remove required=false from docs (#11055)

(cherry picked from commit a9a4f89033)

Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>

plugins/modules/slackpkg.py

@@ -38,14 +38,12 @@ options:
     description:
       - State of the package, you can use V(installed) as an alias for V(present) and V(removed) as one for V(absent).
     choices: ['present', 'absent', 'latest', 'installed', 'removed']
-    required: false
     default: present
     type: str
 
   update_cache:
     description:
       - Update the package database first.
-    required: false
     default: false
     type: bool