fix annotation

face_recognition/api.py

@@ -65,7 +65,7 @@ def face_distance(face_encodings, face_to_compare):
     Given a list of face encodings, compare them to a known face encoding and get a euclidean distance
     for each comparison face. The distance tells you how similar the faces are.
 
-    :param faces: List of face encodings to compare
+    :param face_encodings: List of face encodings to compare
     :param face_to_compare: A face encoding to compare against
     :return: A numpy ndarray with the distance for each face in the same order as the 'faces' array
     """