chore(dashboard): update dashboard quickstart for consistency

Author: goosewin

fern/quickstart/dashboard.mdx

@@ -1,6 +1,6 @@
 ---
 title: Dashboard
-subtitle:  Learn to build a voice agent in under 5 minutes.
+subtitle: Learn to build a voice agent in under 5 minutes using the Vapi dashboard.
 slug: quickstart/dashboard
 ---
 
@@ -138,4 +138,4 @@ Vapi makes it easy to build end-to-end voice agents, which we call ***assistants
       You will learn more about configuring call end behaviour in later guides.
     </Tip>
   </Step>
-</Steps>
+</Steps>