[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/docs/README.md b/docs/README.md
index 3107d57..79a75af 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -170,6 +170,9 @@
 *   [IPC Fuzzer](testing/ipc_fuzzer.md) - Fuzz testing of Chromium IPC interfaces.
 *   [Running Chrome tests with AddressSanitizer (asan) and LeakSanitizer (lsan)](testing/linux_running_asan_tests.md) -
     Run Chrome tests with ASAN and LSAN builds to detect addressability issues and memory leaks.
+*   [Code Coverage](testing/code_coverage.md) - Code coverage for Chromium.
+*   [Code Coverage in Gerrit](testing/code_coverage_in_gerrit.md) - Per-CL code
+    coverage in Gerrit to assist code reviews.
 
 ### GPU-related docs
 *   [GPU Pixel Wrangling](gpu/pixel_wrangling.md) - Instructions for GPU