Point opt-out at the Stack v3 Space and the opt-out-v2 instructions

README.md

@@ -278,9 +278,11 @@ against (`d7bc7991ea32`) was squashed away within a day, so source SHAs are
 not durable references. We therefore record the filter date alongside the SHA, and
 re-verify against the current HEAD (`2b4797afd567`) rather than assuming an
 old SHA still resolves. If you find your code
-here, use the
-[Am I in The Stack?](https://huggingface.co/spaces/bigcode/in-the-stack) opt-out
-process; we re-filter on each upstream patch release.
+here, check inclusion in the source corpus with the
+[Am I in The Stack?](https://huggingface.co/spaces/HuggingFaceCode/in-the-stack)
+Space and submit a removal request following the
+[opt-out instructions](https://github.com/bigcode-project/opt-out-v2); we
+re-filter on each upstream patch release.
 
 ## Known limitations