docs: add note about use(Context) support in React 19 to useContext reference

Informs developers that starting in React 19, use(Context) can be used instead of useContext(Context) to read context inside conditionals and loops.

Author: ChijiokeUhegwu

src/content/reference/react/useContext.md

@@ -12,6 +12,12 @@ const value = useContext(SomeContext)
 
 </Intro>
 
+<Note>
+
+Starting in React 19, you can use [`use(Context)`](/reference/react/use) instead of `useContext(Context)`, which allows you to read context in conditionals and loops.
+
+</Note>
+
 <InlineToc />
 
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