docs: fix sendGAEvent example

Author: tschoffelen

docs/02-app/01-building-your-application/06-optimizing/12-third-party-libraries.mdx

@@ -294,7 +294,7 @@ export function EventButton() {
   return (
     <div>
       <button
-        onClick={() => sendGAEvent({ event: 'buttonClicked', value: 'xyz' })}
+        onClick={() => sendGAEvent('event', 'buttonClicked', { value: 'xyz' })}
       >
         Send Event
       </button>
@@ -314,7 +314,7 @@ export function EventButton() {
   return (
     <div>
       <button
-        onClick={() => sendGAEvent({ event: 'buttonClicked', value: 'xyz' })}
+        onClick={() => sendGAEvent('event', 'buttonClicked', { value: 'xyz' })}
       >
         Send Event
       </button>