[Keychron Q1] Fix incorrect reset key docs

The Keychron Q1 comes with a firmware which does not recognize the Esc key as reset during kb start. This feature only becomes available after the kb is flashed with a user-built qmk at least once.

keyboards/keychron/q1/readme.md

@@ -17,5 +17,6 @@ Flashing example for this keyboard:
     make keychron/q1/rev_0100:default:flash
 
 **Reset Key**: Hold down the key located at *K00*, commonly programmed as *Esc* while plugging in the keyboard.
+**Reset Key on Stock Firmware**: Remove the Spacebar keycap, then hold the small reset button while plugging in the keyboard.
 
 See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).