docs: Update CLI documentation (#652)

Co-authored-by: juno-bot <juno-bot@users.noreply.github.com>

Author: github-actions[bot]

docs/reference/cli/emulator.md

@@ -4,6 +4,7 @@ Handle tasks related to the emulator like starting/stopping a local network.
 Usage: juno emulator <subcommand> [options]
 
 Subcommands:
+  clear               Clear the local emulator state (volume and container).
   start               Start the emulator for local development.
   stop                Stop the local network.
   wait                Wait until the emulator is ready.