ALSA: emu10k1: Fix typo in docs

interally => internally

Signed-off-by: Bhanu Seshu Kumar Valluri <bhanuseshukumar@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Author: bhanuseshukumar

Documentation/sound/cards/emu-mixer.rst

@@ -66,7 +66,7 @@ FX-bus
 
 name='Clock Source',index=0
 ---------------------------
-This control allows switching the word clock between interally generated
+This control allows switching the word clock between internally generated
 44.1 or 48 kHz, or a number of external sources.
 
 Note: the sources for the 1616 CardBus card are unclear. Please report your