Fix typo (#489)

push-messaging-and-notifications/README.md

@@ -6,7 +6,7 @@ Learn more at https://www.chromestatus.com/feature/5416033485586432 and https://
 To use this sample please do the following:
 
 1. Create a project on the [Firebase Developer Console](https://console.firebase.google.com).
-1. Go to Settings (The cog near the top left corner), click the 'Cloud Messaging Tab'.
+1. Go to Settings (the cog near the top left corner), click the 'Cloud Messaging Tab'.
 1. Create a copy of [config.sample.js](config.sample.js) called config.js.
 1. Create a copy of [manifest.sample.json](manifest.sample.json) called manifest.json.
 1. Replace `<Your Cloud Messaging API Key ...>` in your new `config.js` file with your own API key from your new project on Firebase Developer Console.