Update links

docs/reuse/links.txt

@@ -1,4 +1,3 @@
-.. _reStructuredText style guide: https://canonical-documentation-with-sphinx-and-readthedocscom.readthedocs-hosted.com/style-guide/
 .. _Read the Docs at Canonical: https://library.canonical.com/documentation/read-the-docs
 .. _How to publish documentation on Read the Docs: https://library.canonical.com/documentation/publish-on-read-the-docs
 .. _Example product documentation: https://canonical-example-product-documentation.readthedocs-hosted.com/