fix(gcode_shell_cmd): update comment to clarify config directory usage (#767)

Author: theogayar

kiauh/extensions/gcode_shell_cmd/gcode_shell_cmd_extension.py

@@ -97,7 +97,7 @@ def remove_extension(self, **kwargs) -> None:
 
     def install_example_cfg(self, instances: List[Klipper]):
         cfg_dirs = [instance.base.cfg_dir for instance in instances]
-        # copy extension to klippy/extras
+        # copy extension to config directories
         for cfg_dir in cfg_dirs:
             Logger.print_status(f"Create shell_command.cfg in '{cfg_dir}' ...")
             if check_file_exist(cfg_dir.joinpath("shell_command.cfg")):