cli: Mention the large index check in the changelog (#43084)

GitOrigin-RevId: bbbc4ee9164ddbd238abec18630124d899afc6f0

Author: Nicolapps

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+- When running `npx convex deploy`, the CLI will now ask for explicit confirmation
+  before deleting large indexes. This change is helpful for avoiding situations
+  where an index is accidentally deleted and backfilling it takes a long time.
+
 ## 1.29.0
 
 - Code generation changes: modules and functions are sorted in more situations,