chore(sponsored-feed) Add a callout (#794)

Author: aditya520

pages/price-feeds/sponsored-feeds.mdx

@@ -15,6 +15,12 @@ The sponsored feeds can vary by network. Please see the relevant section below f
 - [Sui](sponsored-feeds/sui)
 - [Movement](sponsored-feeds/movement)
 
+<Callout type="info" emoji="ℹ️">
+  Sponsored feeds are subject to change with prior notice. Please refer to the
+  [dev forum](https://dev-forum.pyth.network/c/announcements/6) for the latest
+  updates.
+</Callout>
+
 <Callout type="info" emoji="⚠️">
   DISCLAIMER: While the Pyth Data Association strives to deliver timely updates,
   these sponsored feeds may occasionally experience delays in updates caused by