update various Gitiles/GH URLs to use HEAD for the branch

BUG=chromium:1126855
TEST=CQ passes

Change-Id: I649344ade5384273b618248eaa1fc08fe50d6d3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/2702192
Tested-by: Mike Frysinger <vapier@chromium.org>
Auto-Submit: Mike Frysinger <vapier@chromium.org>
Commit-Queue: LaMont Jones <lamontjones@chromium.org>
Reviewed-by: LaMont Jones <lamontjones@chromium.org>
diff --git a/scripts/cros_fuzz.py b/scripts/cros_fuzz.py
index 70395fd..4492a20 100644
--- a/scripts/cros_fuzz.py
+++ b/scripts/cros_fuzz.py
@@ -724,7 +724,7 @@
   except gs.GSCommandError as exception:
     logging.error(
         'gsutil failed to download the corpus. You may need to log in. See:\n'
-        'https://chromium.googlesource.com/chromiumos/docs/+/master/gsutil.md'
+        'https://chromium.googlesource.com/chromiumos/docs/+/HEAD/gsutil.md'
         '#setup\n'
         'for instructions on doing this.')
     raise exception