Update encoding.py

hw3/encoding.py

@@ -22,7 +22,7 @@ def delta_encoding(data):
 
 	   delta_encoding encoding returns a list where the first
 	   element is the original value and all the rest of the
-	   elements are deltas from the first value.
+	   elements are deltas from the previous value.
 	'''
 
 	raise ValueError('Not implemented')