consistent casing and run snippets

Author: morganchen12

firestore-temp/test.firestore.js

@@ -126,10 +126,10 @@ describe("firestore-pipelines", () => {
       const cities = await db.pipeline()
         .collection("cities")
         .aggregate({
-          accumulators: [field("population").sum().as("total_population")],
+          accumulators: [field("population").sum().as("totalPopulation")],
           groups: ["location.state"]
         })
-        .where(field("total_population").greaterThan(10000000))
+        .where(field("totalPopulation").greaterThan(10000000))
         .execute();
       // [END where_having_example]
       console.log(cities);

snippets/firestore-temp/test-firestore/where_having_example.js

@@ -8,9 +8,9 @@
 const cities = await db.pipeline()
   .collection("cities")
   .aggregate({
-    accumulators: [field("population").sum().as("total_population")],
+    accumulators: [field("population").sum().as("totalPopulation")],
     groups: ["location.state"]
   })
-  .where(field("total_population").greaterThan(10000000))
+  .where(field("totalPopulation").greaterThan(10000000))
   .execute();
 // [END where_having_example_modular]