doc: Remove pre-v2 callout

Author: franky47

Diff for: packages/docs/content/docs/options.mdx

@@ -171,10 +171,6 @@ the updated URL.
 Pass in the `startTransition{:ts}` function from `useTransition{:ts}` to the options
 to enable this behaviour:
 
-<Callout title="Upcoming changes" type="warn">
-  In `nuqs@2.0.0`, passing `startTransition` will no longer automatically set `shallow: false{:ts}`.
-</Callout>
-
 ```tsx /startTransition/1,3#2
 'use client'