[code coverage] Update documentation for code coverage

This CL updates the documentation for code coverage.

[email protected]

Bug: 974379
Change-Id: If9abde5ce40793a7a4d265703fb695126d8f0e56
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1663371
Commit-Queue: Yuke Liao <[email protected]>
Reviewed-by: John Budorick <[email protected]>
Reviewed-by: Erik Staab <[email protected]>
Cr-Commit-Position: refs/heads/master@{#671397}
diff --git a/tools/code_coverage/coverage.py b/tools/code_coverage/coverage.py
index 8d71110..67d622d7 100755
--- a/tools/code_coverage/coverage.py
+++ b/tools/code_coverage/coverage.py
@@ -62,7 +62,7 @@
   For more options, please refer to tools/code_coverage/coverage.py -h.
 
   For an overview of how code coverage works in Chromium, please refer to
-  https://chromium.googlesource.com/chromium/src/+/master/docs/code_coverage.md
+  https://chromium.googlesource.com/chromium/src/+/master/docs/testing/code_coverage.md
 """
 
 from __future__ import print_function