TAPPING_FORCE_HOLD needs documentation

[drashna]

As title.
#889
#1098

qmk_firmware/tmk_core/common/action_tapping.c

Lines 235 to 246 in 7c9d5ac

	#ifndef TAPPING_FORCE_HOLD
	if (!tapping_key.tap.interrupted && tapping_key.tap.count > 0) {
	// sequential tap.
	keyp->tap = tapping_key.tap;
	if (keyp->tap.count < 15) keyp->tap.count += 1;
	debug("Tapping: Tap press("); debug_dec(keyp->tap.count); debug(")\n");
	process_record(keyp);
	tapping_key = *keyp;
	debug_tapping_key();
	return true;
	}
	#endif

[drashna]

Was documented.