[useCallback] Remove duplicated spaces

src/content/reference/react/useCallback.md

@@ -52,7 +52,7 @@ export default function ProductPage({ productId, referrer, theme }) {
 
 On the initial render, `useCallback` returns the `fn` function you have passed.
 
-During subsequent renders, it will either return an already stored `fn`  function from the last render (if the dependencies haven't changed), or return the `fn` function you have passed during this render.
+During subsequent renders, it will either return an already stored `fn` function from the last render (if the dependencies haven't changed), or return the `fn` function you have passed during this render.
 
 #### Caveats {/*caveats*/}
 
@@ -224,7 +224,7 @@ function useCallback(fn, dependencies) {
 
 If your app is like this site, and most interactions are coarse (like replacing a page or an entire section), memoization is usually unnecessary. On the other hand, if your app is more like a drawing editor, and most interactions are granular (like moving shapes), then you might find memoization very helpful.
 
-Caching a function with `useCallback`  is only valuable in a few cases:
+Caching a function with `useCallback` is only valuable in a few cases:
 
 - You pass it as a prop to a component wrapped in [`memo`.](/reference/react/memo) You want to skip re-rendering if the value hasn't changed. Memoization lets your component re-render only if dependencies changed.
 - The function you're passing is later used as a dependency of some Hook. For example, another function wrapped in `useCallback` depends on it, or you depend on this function from [`useEffect.`](/reference/react/useEffect)