Add deprecation notice for FormEvent and FormEventHandler

Update documentation to reflect deprecation of FormEvent and FormEventHandler in React v19.2.10, suggesting use of SubmitEvent and SubmitEventHandler.

Author: maurer2

docs/basic/getting-started/forms-and-events.md

@@ -59,6 +59,9 @@ The first method uses an inferred method signature `(e: React.FormEvent<HTMLInpu
 
 </details>
 
+> Starting with React v19.2.10 `FormEvent` and `FormEventHandler` are deprecated and should be replaced with `SubmitEvent` and `SubmitEventHandler`. The older event types will still work but trigger a deprecation message.
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 **Typing onSubmit, with Uncontrolled components in a Form**
 
 If you don't quite care about the type of the event, you can just use `React.SyntheticEvent`. If your target form has custom named inputs that you'd like to access, you can use a type assertion: