CI/DOC: Fix docbuild link warnings (1.4.x manual backport)
Performing this manually since there were some recent changes to `doc/source/ecosystem.rst` and `doc/source/user_guide/cookbook.rst` that were not backported

nice! > Performing this manually since there were some recent changes to `doc/source/ecosystem.rst` and `doc/source/user_guide/cookbook.rst` that were not backported

have now backported #45408