Add tip about cmd+backspace

Author: strackoverflow

data/reusables/command-palette/change-scope.md

@@ -2,4 +2,4 @@
 
    - To narrow the scope within a user or organization account, highlight a repository then use <kbd>Tab</kbd> to add it to the scope.
    - To expand the scope, highlight and remove an item in the scope using the <kbd>Backspace</kbd> or <kbd>delete</kbd> key.
-   - To clear the scope and text box, click **Clear**.
+   - To clear the scope and text box, click **Clear** or use <kbd>Ctrl</kbd><kbd>Backspace</kbd> (Windows and Linux) or <kbd>⌘</kbd><kbd>Backspace</kbd> (Mac).