hyprctl: add submap

pages/Configuring/Using-hyprctl.md

@@ -328,6 +328,7 @@ configerrors - lists all current config parsing errors
 rollinglog - prints tail of the log. Also supports -f/--follow option
 locked - prints whether the current session is locked.
 descriptions - returns a JSON with all config options, their descriptions and types.
+submap - prints the current submap the keybinds are in
 ```
 
 For the getoption command, the option name should be written as