Update README.rst

Author: BlitzCityDIY

README.rst

@@ -101,7 +101,7 @@ Usage Example
 	dac = adafruit_tlv320.TLV320DAC3100(i2c)
 
 	# set mclk, sample rate & bit depth
-	dac.configure_clocks(mclk_freq=12000000, sample_rate=44100, bit_depth=16)
+	dac.configure_clocks(sample_rate=44100, bit_depth=16)
 
 	# use headphones
 	# helper function for default settings