Wrong link in Roadmap

[CanePlayz]

Provide a description of requested docs changes

Bugs should link to
https://github.com/microsoft/PowerToys/issues?q=is%3Aopen+is%3Aissue+milestone%3A%22Stability+Release%22
instead of
https://github.com/microsoft/PowerToys/issues?q=is%3Aopen+is%3Aissue+milestone%3A%222020+Stability+Release%22
since the first one has the correct label.

[cinnamon-msft]

Roadmap has been updated :)

[CanePlayz]

Thanks 🫣😄