Update aptos.mdx (#587)

edit to 15s

Author: KemarTiti

pages/price-feeds/sponsored-feeds/aptos.mdx

@@ -2,7 +2,7 @@
 
 The price feeds listed in the table below are currently sponsored in **Aptos mainnet**.
 
-Update Parameters: **2 second heartbeat or 0.5% price deviation**
+Update Parameters: **15 second heartbeat or 0.5% price deviation**
 
 | Name      | Price Feed Id                                                      |
 | --------- | ------------------------------------------------------------------ |