fix(firestore): Incorrect error message for GeoPoint latitude out of range

Author: zholmes1

packages/firestore/lib/FirestoreGeoPoint.js

@@ -35,7 +35,7 @@ export default class FirestoreGeoPoint {
 
     if (!isFinite(latitude) || latitude < -90 || latitude > 90) {
       throw new Error(
-        `firebase.firestore.GeoPoint 'longitude' must be a number between -90 and 90, but was: ${latitude}.`,
+        `firebase.firestore.GeoPoint 'latitude' must be a number between -90 and 90, but was: ${latitude}.`,
       );
     }