[Keymap] Update andrebrait keymap for GMMK Pro (#21133)

keyboards/gmmk/pro/rev1/ansi/keymaps/andrebrait/readme.md

@@ -7,15 +7,23 @@ The differences are as follows:
 
 - Dedicated MacOS and Windows/Linux layers
   - Switching between them by pressing Fn + CAPS LOCK
+- VIA support
 - Disabled Mouse Keys (to fix issues with KVM switches and also because they're not used here anyway)
 - RGB turns off after 20 minutes of inactivity
 - RGB turns off when USB is suspended
 - Layer 0:
-  - Print Screen (default) -> Delete
-  - Delete (default) -> Home
+  - Delete -> Insert
+  - Page Up -> Delete
+  - Page Down -> Home
 - Layer 1 (accessed by pressing Fn):
-  - Fn + Delete -> Insert
-  - Fn + Home -> Print Screen
+  - Fn + Insert -> Pause
+  - Fn + Delete -> Scroll Lock
+  - Fn + Esc -> Clear EEPROM
+  - Fn + (Left) CMD (macOS layout) -> Toggle the CMD + Q delay
+
+On the Mac layer, pressing CMD + Q will not immediately send the combination.\
+There's a configurable delay (defaults to 1 second) to send it.\
+This is done mainly to prevent hitting CMD + Q by mistake when alternating between applications with CMD + Tab.
 
 This keymap also includes CAPS LOCK ON indicator.\
 All left and right side LEDs, and the Caps key LED will turn solid red while CAPS LOCK is ON.