* Defined IS_(HOST_)LED_ON/OFF() and improved LED documentation * Update docs/custom_quantum_functions.md Co-Authored-By: DidierLoiseau <didierloiseau+github@gmail.com> * Update docs/custom_quantum_functions.md Co-Authored-By: DidierLoiseau <didierloiseau+github@gmail.com> * Integrated @drashna and @fauxpark's PR comments - changed all plurals of "LED" to "LEDs" in the file - rewording of the note about host_keyboard_leds() vs. led_set_user() * Update docs/custom_quantum_functions.md Co-Authored-By: DidierLoiseau <didierloiseau+github@gmail.com>