Fix link to Buildifier
Just fixing a broken link in the docs.
Closes
@@ -8,7 +8,7 @@ title: Skylint
This document explains how to use Skylint, a Starlark linter.
Skylint is no longer maintained. It will be replaced soon with [Buildifier](
-https://github.com/bazelbuild/buildtools/blob/master/buildifier/README.md#linter).
+https://github.com/bazelbuild/buildtools/tree/master/buildifier#linter).
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