Correct link to patch utility functions.
Closes
@@ -83,4 +83,4 @@ the `@bazel_tools` built-in external repository.
- [`http_archive`](repo/http.html#http_archive)
- [`http_file`](repo/http.html#http_archive)
- [`http_jar`](repo/http.html#http_jar)
- - [Utility functions on patching](utils.md)
+ - [Utility functions on patching](repo/utils.md)
