Update link to PIP compatibility documentation

[samhaese]

Summary

The link in PIP_COMPATIBILITY.md was out of date. This PR just updates it to point to the relevant page on the current documentation site.

Test Plan

No testing.

[duriantaco]

Thanks for the PR! The CI failures look mechanical:

Could you run:

npm ci
npm run format
cargo dev generate-all
git status
git add -u
git commit -m "chore: refresh formatting and generated files"
git push

I will do #167

[duriantaco]

#167 is closed. Do let me know if you need me to help with the issue.

[samhaese]

Please go ahead and finish this one out, I would appreciate the help.