Fix typos

Author: PaintYourDragon

Adafruit_Thermal.py

@@ -348,7 +348,7 @@ def printBarcode(self, text, type):
 				super(Adafruit_Thermal, self).write(chr(n))
 				for i in range(n):
 					super(Adafruit_Thermal,
-					  self).write(text[n])
+					  self).write(text[i])
 		else:
 			# Older firmware: write string + NUL
 			if self.writeToStdout:

printertest.py

@@ -61,7 +61,7 @@
 import gfx.adaqrcode as adaqrcode
 printer.printBitmap(adaqrcode.width, adaqrcode.height, adaqrcode.data)
 printer.println("Adafruit!")
-printer.feed(1)
+printer.feed(2)
 
 printer.sleep()      # Tell printer to sleep
 printer.wake()       # Call wake() before printing again, even if reset