Remove internal link

PiperOrigin-RevId: 300548420
diff --git a/site/docs/user-manual.html b/site/docs/user-manual.html
index 27f6492..1c31494 100644
--- a/site/docs/user-manual.html
+++ b/site/docs/user-manual.html
@@ -1229,8 +1229,7 @@
 <h4 id="flag--test_filter"><code class='flag'>--test_filter=<var>filter-expression</var></code></h4>
 <p>
   Specifies a filter that the test runner may use to pick a subset of tests for
-  running. See <a href="http://go/testfilter">go/testfilter</a> for how the filter does matching for your language.
-  All targets specified in the invocation are built, but depending on
+  running. All targets specified in the invocation are built, but depending on
   the expression only some of them may be executed; in some cases, only certain
   test methods are run.
 </p>