telnyx docs image url fix

Author: rmcwhorter

fern/phone-numbers/telnyx.mdx

@@ -26,7 +26,7 @@ This guide details how to import your existing Telnyx phone numbers to the Vapi
 </Note>
 
 <Frame>
-  <img src="../static/images/telnyx-modal.png" />
+  <img src="../static/images/quickstart/dashboard/telnyx-modal.png" />
 </Frame>
 
 </Steps>