update comments

Author: VinayGuthal

firebase-ai/src/main/kotlin/com/google/firebase/ai/LiveGenerativeModel.kt

@@ -69,7 +69,7 @@ internal constructor(
     requestOptions: RequestOptions = RequestOptions(),
     appCheckTokenProvider: InteropAppCheckTokenProvider? = null,
     internalAuthProvider: InternalAuthProvider? = null,
-    generativeBackend: GenerativeBackend? = null,
+    generativeBackend: GenerativeBackend,
   ) : this(
     modelName,
     blockingDispatcher,

firebase-ai/src/main/kotlin/com/google/firebase/ai/common/APIController.kt

@@ -171,7 +171,7 @@ internal constructor(
       null ->
         "wss://firebasevertexai.googleapis.com/ws/google.firebase.vertexai.v1beta.LlmBidiService/BidiGenerateContent/locations/$location?key=$key"
       GenerativeBackendEnum.GOOGLE_AI ->
-        "wss://firebasevertexai.googleapis.com//ws/google.firebase.vertexai.v1beta.GenerativeService/BidiGenerateContent?key=$key"
+        "wss://firebasevertexai.googleapis.com/ws/google.firebase.vertexai.v1beta.GenerativeService/BidiGenerateContent?key=$key"
     }
 
   suspend fun getWebSocketSession(location: String): ClientWebSocketSession =