fix link

Author: saritai

docs/codeql/README.rst

@@ -12,7 +12,7 @@ see https://docutils.sourceforge.io/rst.html.
 
 For more information on Sphinx, see https://www.sphinx-doc.org.
 
-For information on contributing to CodeQL documentation, see the "[contributing guide](/CONTRIBUTING.md)."
+For information on contributing to CodeQL documentation, see the `contributing guide </CONTRIBUTING.md>`__.
 
 Project structure
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