add simpler snippet

Author: morganchen12

firestore-next/test.firestore.js

@@ -1160,9 +1160,17 @@ describe("firestore", () => {
 
     describe("aggregate queries", () => {
       it("should fetch the count of documents in a collection", async () => {
+        // [START count_aggregate_collection]
+        const coll = collection(db, "cities");
+        const snapshot = await getCountFromServer(coll);
+        console.log('count: ', snapshot.data().count);
+        // [END count_aggregate_collection]
+      });
+
+      it("should fetch the count of documents in a query", async () => {
         // [START count_aggregate_query]
-        const coll = collection(db, "games/chess/players");
-        const query = query(coll, where("online", "==", true));
+        const coll = collection(db, "cities");
+        const query = query(coll, where("state", "==", "CA"));
         const snapshot = await getCountFromServer(query);
         console.log('count: ', snapshot.data().count);
         // [END count_aggregate_query]