Fix typo in testing documentation.

Change-Id: Ic0a245f29020ec2c2b8679ed56f285312312d126
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1696834
Commit-Queue: Victor Costan <pwnall@chromium.org>
Auto-Submit: Staphany Park <staphany@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676313}

docs/testing/web_test_expectations.md

@@ -266,7 +266,7 @@ You would expect:
 * `fast/html/article-element.html` to fail with a text diff (since it is in the
   fast/html directory).
 * `fast/html/keygen.html` to pass (since the exact match on the test name).
-* `fast/html/submit.html` to pass (since the configuration parameters don't
+* `fast/forms/submit.html` to pass (since the configuration parameters don't
   match).
 * `fast/html/section-element.html` to either crash or produce a text (or image
   and text) failure, but not time out or pass.