Documentation: sound: fix typo in control-names.rst

change 'cannel' to 'channel'
Signed-off-by: NSunrisepeak <speakshen@163.com>
Link: https://lore.kernel.org/r/20220227145204.16600-1-speakshen@163.comSigned-off-by: NTakashi Iwai <tiwai@suse.de>

Documentation/sound/designs/control-names.rst

@@ -34,7 +34,7 @@ CHANNEL
 Front		front left/right channels
 Surround	rear left/right in 4.0/5.1 surround
 CLFE		C/LFE channels
-Center		center cannel
+Center		center channel
 LFE		LFE channel
 Side		side left/right for 7.1 surround
 ============	==================================================