Update useCallback.md - rename ShoppingForm to ShippingForm (#5656)

Author: skyhawk14

beta/src/content/reference/react/useCallback.md

@@ -385,9 +385,9 @@ button[type="button"] {
 
 #### Always re-rendering a component {/*always-re-rendering-a-component*/}
 
-In this example, the `ShoppingForm` implementation is also **artificially slowed down** so that you can see what happens when some React component you're rendering is genuinely slow. Try incrementing the counter and toggling the theme.
+In this example, the `ShippingForm` implementation is also **artificially slowed down** so that you can see what happens when some React component you're rendering is genuinely slow. Try incrementing the counter and toggling the theme.
 
-Unlike in the previous example, toggling the theme is also slow now! This is because **there is no `useCallback` call in this version,** so `handleSubmit` is always a new function, and the slowed down `ShoppingForm` component can't skip re-rendering.
+Unlike in the previous example, toggling the theme is also slow now! This is because **there is no `useCallback` call in this version,** so `handleSubmit` is always a new function, and the slowed down `ShippingForm` component can't skip re-rendering.
 
 <Sandpack>