Quick spelling clean-up in the auto-bisect code.

tools/auto_bisect/math_utils.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """General statistical or mathematical functions."""
 
 import math
 
 
 def TruncatedMean(data_set, truncate_percent):
   """Calculates the truncated mean of a set of values.
 
   Note that this isn't just the mean of the set of values with the highest
   and lowest values discarded; the non-discarded values are also weighted
   differently depending how many values are discarded.
 
   Args:
     data_set: Non-empty list of values.
-    truncate_percent: The % from the upper and lower portions of the data set
+    truncate_percent: How much of the upper and lower portions of the data set
         to discard, expressed as a value in [0, 1].
 
   Returns:
     The truncated mean as a float.
 
   Raises:
     TypeError: The data set was empty after discarding values.
   """
   if len(data_set) > 2:
     data_set = sorted(data_set)
@@ skipping 93 matching lines @@
 
 
 # Redefining built-in 'StandardError'
 # pylint: disable=W0622
 def StandardError(values):
   """Calculates the standard error of a list of values."""
   if len(values) <= 1:
     return 0.0
   std_dev = StandardDeviation(values)
   return std_dev / math.sqrt(len(values))