Preserve existing startTransition guidance

Author: aurorascharff

src/content/reference/react/startTransition.md

@@ -53,14 +53,7 @@ function TabContainer() {
 
 * You can wrap an update into a Transition only if you have access to the `set` function of that state. If you want to start a Transition in response to some prop or a custom Hook return value, try [`useDeferredValue`](/reference/react/useDeferredValue) instead.
 
-* The function you pass to `startTransition` is called immediately, marking all
-  state updates that happen while it executes as Transitions. If you try to
-  perform state updates in a `setTimeout`, for example, they won't be marked as
-  Transitions. If the function throws an error or returns a rejected Promise,
-  React reports the error as uncaught because the standalone `startTransition`
-  function is not associated with a component. [Learn how to display errors
-  from `useTransition` with an Error
-  Boundary.](/reference/react/useTransition#displaying-an-error-to-users-with-error-boundary)
+* The function you pass to `startTransition` is called immediately, marking all state updates that happen while it executes as Transitions. If you try to perform state updates in a `setTimeout`, for example, they won't be marked as Transitions.
 
 * You must wrap any state updates after any async requests in another `startTransition` to mark them as Transitions. This is a known limitation that we will fix in the future (see [Troubleshooting](/reference/react/useTransition#react-doesnt-treat-my-state-update-after-await-as-a-transition)).
 
@@ -99,11 +92,14 @@ With a Transition, your UI stays responsive in the middle of a re-render. For ex
 
 <Note>
 
-The standalone `startTransition` and the function returned by
-[`useTransition`](/reference/react/useTransition) both mark state updates as
-Transitions. Unlike `useTransition`, the standalone function does not provide
-the `isPending` flag. It is not a Hook, so you can call it outside components.
-[See Caveats.](#caveats)
+`startTransition` is very similar to
+[`useTransition`](/reference/react/useTransition), except that it does not
+provide the `isPending` flag to track whether a Transition is ongoing. The
+standalone function is also not associated with a component, so if the function
+passed to it throws an error or returns a rejected Promise, React reports the
+error as uncaught. You can call `startTransition` when `useTransition` is not
+available. For example, `startTransition` works outside components, such as from
+a data library.
 
 [Learn about Transitions and see examples on the `useTransition` page.](/reference/react/useTransition)