replace start-airflow with stop_airflow (apache#56390)

Author: anujarora0502

contributing-docs/03a_contributors_quick_start_beginners.rst

@@ -84,7 +84,7 @@ Option A – Breeze on Your Laptop
 
 The command starts a shell and launches multiple terminals using tmux
 and launches all Airflow necessary components in those terminals. To know more about tmux commands,
-check out this cheat sheet: https://tmuxcheatsheet.com/. To exit breeze, type ``start-airflow`` in any
+check out this cheat sheet: https://tmuxcheatsheet.com/. To exit breeze, type ``stop_airflow`` in any
 of the tmux panes and hit Enter.
 
 **Working with DAGs in Breeze:**