s/Realtime Database/Cloud Firestore in comments.

quickstarts/uppercase-firestore/functions/index.js

@@ -20,14 +20,14 @@
 // The Cloud Functions for Firebase SDK to create Cloud Functions and setup triggers.
 const functions = require('firebase-functions');
 
-// The Firebase Admin SDK to access the Firebase Realtime Database.
+// The Firebase Admin SDK to access the Cloud Firestore.
 const admin = require('firebase-admin');
 admin.initializeApp();
 // [END import]
 
 // [START addMessage]
 // Take the text parameter passed to this HTTP endpoint and insert it into the
-// Realtime Database under the path /messages/:documentId/original
+// Cloud Firestore under the collection 'messages'.
 // [START addMessageTrigger]
 exports.addMessage = functions.https.onRequest((req, res) => {
 // [END addMessageTrigger]
@@ -51,13 +51,13 @@ exports.makeUppercase = functions.firestore.document('/messages/{documentId}')
     .onCreate((snap, context) => {
 // [END makeUppercaseTrigger]
       // [START makeUppercaseBody]
-      // Grab the current value of what was written to the Realtime Database.
+      // Grab the current value of what was written to the Cloud Firestore.
       const original = snap.data().original;
       console.log('Uppercasing', context.params.documentId, original);
       const uppercase = original.toUpperCase();
       // You must return a Promise when performing asynchronous tasks inside a Functions such as
-      // writing to the Firebase Realtime Database.
-      // Setting an 'uppercase' sibling in the Realtime Database returns a Promise.
+      // writing to the Cloud Firestore.
+      // Setting an 'uppercase' field in the Cloud Firestore document returns a Promise.
       return snap.ref.set({uppercase}, {merge: true});
       // [END makeUppercaseBody]
     });