Fix recommended rules block in external BE.
RELNOTES:
@@ -47,9 +47,8 @@ Native rules ship with the Bazel binary and do not require a <code>load</code> s
Native rules are available globally in BUILD files. In .bzl files, you can find them in
the <code>native</code> module.
- -->
For non-native Starlark rules that ship separately from Bazel, see the list of
-<a href="rules.html#recommended-rules">Recommended Rules</a>.
+<a href="../rules.html#recommended-rules">Recommended Rules</a>.
<h3>Language-specific native rules</h3>
