Update README_DLM_LEGACY with repository URL

README_DLM_LEGACY.md

@@ -3,7 +3,7 @@
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 > [!NOTE]
-> This is legacy documentation references of Deep Learning Model extension
+> This is legacy documentation references of [Deep Learning Model extension](https://github.com/crim-ca/dlm-extension)
 > preceding the current Machine Learning Model (MLM) extension.
 
 <!-- lint enable no-undefined-references -->