Add link to "Useful functions" in macro docs (#7446)

* Add link to "Useful functions" in macro docs

Help people find additional features they can activate within a macro

* Update docs/feature_macros.md

Co-Authored-By: Drashna Jaelre <drashna@live.com>

Co-authored-by: skullydazed <skullydazed@users.noreply.github.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>

docs/feature_macros.md

@@ -154,6 +154,8 @@ SEND_STRING(".."SS_TAP(X_END));
 
 There are some functions you may find useful in macro-writing. Keep in mind that while you can write some fairly advanced code within a macro, if your functionality gets too complex you may want to define a custom keycode instead. Macros are meant to be simple.
 
+?> You can also use the functions described in [Useful function](ref_functions.md) for additional functionality. For example `reset_keyboard()` allows you to reset the keyboard as part of a macro.
+
 ### `record->event.pressed`
 
 This is a boolean value that can be tested to see if the switch is being pressed or released. An example of this is