Fix tootctl syntax

Author: thespad

readme-vars.yml

@@ -84,7 +84,7 @@ app_setup_block: |
 
   Both of the secret generation aliases above can be run without any other setup having been carried out.
   
-  * To use `tootctl` you can run something like `docker exec -it lscr.io/linuxserver/mastodon tootctl <command>`
+  * To use `tootctl` you can run something like `docker exec -it lscr.io/linuxserver/mastodon /tootctl <command>`
 
   Using `tootctl` requires you to complete the initial Mastodon configuration first.