Update overview.mdx

Signed-off-by: tcaldwell-x <tcaldwell@twitter.com>

Author: tcaldwell-x

overview.mdx

@@ -47,7 +47,7 @@ Earn free [xAI API](https://docs.x.ai) credits when you purchase X API credits 
       pointerEvents: 'none',
       filter: 'grayscale(1)'
     }}>
-      <img src="/logo/grok.svg" alt="Grok logo" style={{ width: '100%' }} />
+      <img src="/logo/logo.svg" alt="X logo" style={{ width: '100%' }} />
     </div>
     <div style={{ position: 'relative', zIndex: 1 }}>
       The X Activity API is officially out of beta. Subscribe to real-time activity events like profile updates, follows, and more with <span style={{fontWeight: 500, color: 'rgba(255,255,255,0.75)'}}>sub-second delivery</span> via streaming or webhooks.