Replace non-inclusive terms

Bug: 1118410, 1118413, 1118422, 1118424, 1118426
Bug: 1118428, 1118430, 1118434, 1118438, 1118442
Bug: 1118453, 1118454
Recipe-Nontrivial-Roll: chromiumos
Recipe-Nontrivial-Roll: build
Change-Id: I43e6305f8c3136774f01b57f12bb442bcb863371
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2551388
Commit-Queue: Josip Sokcevic <sokcevic@google.com>
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
diff --git a/git_new_branch.py b/git_new_branch.py
index f2ca024..3a07c27 100755
--- a/git_new_branch.py
+++ b/git_new_branch.py
@@ -3,7 +3,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 """
-Create new branch tracking origin/master by default.
+Create new branch tracking origin HEAD by default.
 """
 
 import argparse