Minor cleanup

Author: dmurvihill

API.md

@@ -224,8 +224,9 @@ Finds a user previously created with [`createUser`](https://www.firebase.com/doc
 ##### `updateUser(user)` -> `Promise<Object>`
 
 Replace the existing user with a new one, by matching uid. Throws an
-error If no user exists whose uid matches the given user's uid. Returns
-the updated user.
+error If no user exists whose uid matches the given user's uid. Resolves
+with the updated user when complete. This operation is queued until the
+next flush.
 
 ## Server Timestamps
 

src/firebase-auth.js

@@ -95,10 +95,10 @@ FirebaseAuth.prototype.updateUser = function (newUser) {
     this._defer('updateUser', _.toArray(arguments), () => {
       const i = _.findIndex(self._auth.users, u => u.uid === newUser.uid);
       if (i === -1) {
-        return reject(new Error('Tried to update a nonexistent user'));
+        reject(new Error('Tried to update a nonexistent user'));
       } else {
         self._auth.users[i] = newUser.clone();
-        return resolve(newUser);
+        resolve(newUser);
       }
     });
   });