fix(docs): add missing CLI flag in docs.

Updates the cli-docs.md adding the new readiness probe configuration in
the CLI API reference documentation

Signed-off-by: José Guilherme Vanz <jguilhermevanz@suse.com>

Author: jvanz

cli-docs.md

@@ -67,6 +67,9 @@ This document contains the help content for the `policy-server` command-line pro
   Default value: `2`
 * `--port <PORT>` — Listen on PORT
 
+  Default value: `3000`
+* `--readiness-probe-port <READINESS_PROBE_PORT>` — Expose readiness endpoint on READINESS_PROBE_PORT
+
   Default value: `3000`
 * `--sigstore-cache-dir <SIGSTORE_CACHE_DIR>` — Directory used to cache sigstore data