clarify analog pins

Author: ladyada

adafruit_touchscreen.py

@@ -68,8 +68,8 @@ def __init__(self, x1_pin, x2_pin, y1_pin, y2_pin, *,
         """Create the Touchscreen object. At a minimum you need the 4 pins
         that will connect to the 4 contacts on a screen. X and Y are just our
         names, you can rotate and flip the data if you like. All pins must be
-        capable of becoming DigitalInOut pins. 'y2_pin' and 'x2_pin' must also
-        be capable of becoming AnalogIn pins.
+        capable of becoming DigitalInOut pins. 'y2_pin', 'x1_pin' and 'x2_pin'
+	must also be capable of becoming AnalogIn pins.
         If you know the resistance across the x1 and x2 pins when not touched,
         pass that in as 'x_resistance'.
         By default we oversample 4 times, change by adjusting 'samples' arg.

examples/touchscreen_simpletest.py

@@ -1,8 +1,8 @@
 import board
 import adafruit_touchscreen
 
-# These pins are used as both analog and digital! XR and YU must be analog
-# and digital capable. XL and YD just need to be digital
+# These pins are used as both analog and digital! XL, XR and YU must be analog
+# and digital capable. YD just need to be digital
 ts = adafruit_touchscreen.Touchscreen(board.TOUCH_XL, board.TOUCH_XR,
                                       board.TOUCH_YD, board.TOUCH_YU,
                                       calibration=((5200, 59000), (5800, 57000)),