Removed internal temperature docstring example

The getFeedback() method had an example that implied that
reading from AIN30 would give the internal temperature. The
getTemperature() method is the proper way to do that, so
we updated the docstring with an AIN4 example.

src/u3.py

@@ -640,18 +640,18 @@ def getFeedback(self, *commandlist):
         Examples:
         >>> myU3 = u3.U3()
         >>> ledCommand = u3.LED(False)
-        >>> internalTempCommand = u3.AIN(30, 31, True)
-        >>> myU3.getFeedback(ledCommand, internalTempCommand)
-        [None, 23200]
+        >>> ain0Command = u3.AIN(0, 31, True)
+        >>> myU3.getFeedback(ledCommand, ain0Command)
+        [None, 9376]
 
         OR if you like the list version better:
         
         >>> myU3 = U3()
         >>> ledCommand = u3.LED(False)
-        >>> internalTempCommand = u3.AIN(30, 31, True)
-        >>> commandList = [ ledCommand, internalTempCommand ]
+        >>> ain0Command = u3.AIN(30, 31, True)
+        >>> commandList = [ ledCommand, ain0Command ]
         >>> myU3.getFeedback(commandList)
-        [None, 23200]
+        [None, 9376]
         
         """