COIL: Migrate to HEAD

Update links to point to HEAD

BUG=b:224796805
TEST=navigate to updated link and/or N/A

Change-Id: I8793365850577b8eb773b7ede156deac056759b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/tauto/+/5159947
Commit-Queue: Derek Beckett <[email protected]>
Auto-Submit: Jonathon Murphy <[email protected]>
Commit-Queue: Jonathon Murphy <[email protected]>
Tested-by: Jonathon Murphy <[email protected]>
Reviewed-by: Otabek Kasimov <[email protected]>
Reviewed-by: Derek Beckett <[email protected]>
diff --git a/src/autotest_lib/docs/user-doc.md b/src/autotest_lib/docs/user-doc.md
index af4dedb..b61d3eb 100644
--- a/src/autotest_lib/docs/user-doc.md
+++ b/src/autotest_lib/docs/user-doc.md
@@ -244,7 +244,7 @@
 ### Running tests on a machine
 
 Autotests are run with a tool called
-[test_that](https://chromium.googlesource.com/chromiumos/third_party/autotest/+/refs/heads/master/docs/test-that.md).
+[test_that](https://chromium.googlesource.com/chromiumos/third_party/autotest/+/HEAD/docs/test-that.md).
 
 ### Running tests in a VM - cros_run_test