Update the code review URL in watchlists.md

Change-Id: Ia549368f095c81a296081aacaf8fd6a05da2b4ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2026407Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Commit-Queue: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737481}

docs/infra/watchlists.md

@@ -3,8 +3,8 @@
 A watchlist is a mechanism that allows a developer (a "watcher") to watch over
 portions of code that the watcher is interested in. A watcher will be cc-ed on
 changes that modify that portion of code, thereby giving that watcher an
-opportunity to make comments on codereview.chromium.org even before the change
-is committed.
+opportunity to make comments on chromium-review.googlesource.com even before the
+change is committed.
 
 **Important :** As watchlists are processed locally when uploading using `git cl
 upload` it is not possible to define watchlists for Gerrit CLs generated by