Add recommendation to default firmware https://docs.splitkb.com/hc/en-us/articles/360017633199-The-keyboard-behaves-erratically-after-changing-the-RGB-settings
* Add information to docs - If layer z is not a higher layer than both x and y, the layer change code does not function correctly. * Update docs/ref_functions.md * Update docs/ref_functions.md * Update docs/ref_functions.md