updated change log

Author: VinayGuthal

firebase-vertexai/CHANGELOG.md

@@ -13,7 +13,7 @@
 * [fixed] Fixed an issue with `LiveContentResponse` audio data not being present when the model was
   interrupted or the turn completed. (#6870)
 * [fixed] Fixed an issue with `LiveSession` not converting exceptions to `FirebaseVertexAIException`. (#6870)
-* [feature] Enable response generation in multiple modalities. 
+* [feature] Enable response generation in multiple modalities. (#6901)
 
 
 # 16.3.0