Improve migration guide re v20
Author: mroderickCreated Mar 24, 2025Updated Apr 30, 2025
In v20, we removed fakeXHR and fakeServer.
It's time. We might want to add some notes to the migration-guide.md about alternatives (msw, etc).
Originally posted by @fatso83 in https://github.com/sinonjs/sinon/pull/2642#pullrequestreview-2698737989
Source: sinonjs/sinon