* Remove obsolete note about media keys in MacOS
KC_MNXT and KC_MPRV work fine on MacOS, so this note is obsolete.
* Document behaviour of MEDIA_FAST_FORWARD/MEDIA_REWIND codes on MacOS
* Small typo fix, and make OS-dependent keycode claim less absolute
* Update docs/keycodes_basic.md
Co-Authored-By: fauxpark <[email protected]>
