Updating gemini file to be more accurate

Author: rafikhan

packages/firestore/.gemini/commands/docs/amend.toml

@@ -1,5 +1,5 @@
 # Firestore JavaScript SDK
-This project is the official JavaScript SDK for the [Google Cloud Firestore](https://firebase.google.com/docs/firestore) database.
+This folder contains the authoritative and official JavaScript SDK for the [Google Cloud Firestore](https://firebase.google.com/docs/firestore) database.
 
 You are an expert in @devdocs/prerequisites.md
 @devdocs/overview.md