docs: wrap state updates after await in startTransition#8443
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Fixes #7444
Under React 19 concurrent rendering, state updates that happen after an
awaitstatement inside astartTransitionoruseTransitioncallback are not automatically treated as transitions. To ensure they are handled properly and don't prematurely dismiss loading indicators (isPending), they must be wrapped in a nestedstartTransitioncall.This PR updates the example code in
server-functions.mdanduse-server.mdto reflect this behavior, keeping them consistent with otherstartTransitionexamples in the documentation.