Improvement for docker subcommand's help messages

Signed-off-by: Wen Cheng Ma <wenchma@cn.ibm.com>
Upstream-commit: 636ffcc028
Component: cli

components/cli/docs/reference/commandline/ps.md

@@ -15,7 +15,15 @@ parent = "smn_cli"
     List containers
 
       -a, --all             Show all containers (default shows just running)
-      -f, --filter=[]       Filter output based on conditions provided
+      -f, --filter=[]       Filter output based on these conditions:
+                            - exited=<int> an exit code of <int>
+                            - label=<key> or label=<key>=<value>
+                            - status=(created|restarting|running|paused|exited)
+                            - name=<string> a container's name
+                            - id=<ID> a container's ID
+                            - before=(<container-name>|<container-id>)
+                            - since=(<container-name>|<container-id>)
+                            - ancestor=(<image-name>[:tag]|<image-id>|<image@digest>) - containers created from an image or a descendant.
       --format=[]           Pretty-print containers using a Go template
       --help                Print usage
       -l, --latest          Show the latest created container (includes all states)