Update firestore changelog

Author: rlazo

firebase-firestore/CHANGELOG.md

@@ -1,11 +1,4 @@
 # Unreleased
-- [fixed] Fix FAILED_PRECONDITION when writing to a deleted document in a transaction.
-  ([Issue #5871](//github.com/firebase/firebase-android-sdk/issues/5871))
-- [fixed] Fixed Firestore failing to raise initial snapshot from empty local cache result. ([PR](https://github.com/firebase/firebase-android-sdk/pull/4207))
-- [fixed] Removed invalid suggestions to use `GenericTypeIndicator` from error messages. ([Issue 222](https://github.com/firebase/firebase-android-sdk/issues/222))
-- [changed] Updated dependency of `io.grpc.*` to its latest
-  version (v1.50.2).
-
 
 # 24.4.1
 * [fixed] Fix `FAILED_PRECONDITION` when writing to a deleted document in a
@@ -23,7 +16,6 @@
 * [changed] Updated dependency of `io.grpc.*` to its latest version
   (v1.50.2).
 
-
 ## Kotlin
 The Kotlin extensions library transitively includes the updated
 `firebase-firestore` library. The Kotlin extensions library has no additional