ASoC: ts3a227e: fix a typo in documentation

There is no "MACBIAS".  It should be "MICBIAS".
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/ts3a227e.txt

@@ -14,7 +14,7 @@ Required properties:
 
 Optional properies:
  - ti,micbias:   Intended MICBIAS voltage (datasheet section 9.6.7).
-      Select 0/1/2/3/4/5/6/7 to specify MACBIAS voltage
+      Select 0/1/2/3/4/5/6/7 to specify MICBIAS voltage
       2.1V/2.2V/2.3V/2.4V/2.5V/2.6V/2.7V/2.8V
       Default value is "1" (2.2V).