docs: link to the testing guidelines in CONTRIBUTING.md

I often remember about these guidelines, and have a hard time finding them every time.
doctrine · Sep 5, 2023 · 646dd89 · 646dd89
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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+This repository has [guidelines specific to testing][testing guidelines], and
 Doctrine has [general contributing guidelines][contributor workflow], make
-sure you follow them.
+sure you follow both.
 
 [contributor workflow]: https://www.doctrine-project.org/contribute/index.html
+[testing guidelines]: https://www.doctrine-project.org/projects/doctrine-dbal/en/stable/reference/testing.html