Fix sponsors link?

Author: rpkilby

docs/community/3.5-announcement.md

@@ -254,7 +254,7 @@ in version 3.3 and raised a deprecation warning in 3.4. Its usage is now mandato
 
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-[sponsors]: https://fund.django-rest-framework.org/topics/funding/#our-sponsors
+[sponsors]: funding.md#our-sponsors
 [funding]: funding.md
 [uploads]: https://core-api.github.io/python-client/api-guide/utils/#file
 [downloads]: https://core-api.github.io/python-client/api-guide/codecs/#downloadcodec