feat!: Update reference from docs to changelogs

Author: manisha1997

UPGRADE.md

@@ -6,7 +6,7 @@ posted here._
 ## [2024-03-07] 9.x.x to 10.x.x
 ### Overview
 
-##### Twilio Python Helper Library’s major version 10.0.0 is now available. Twiml Voice has a breaking change. Please refer to docs.
+##### Twilio Python Helper Library’s major version 10.0.0 is now available. Twiml Voice has a breaking change. Please refer to changelogs.
 
 Twiml Attribute speechModel is now of type string.