fix: Corrected a Typo

mostly -->also

src/content/graphql-js/Tutorial-GettingStarted.md

@@ -9,7 +9,7 @@ next: /graphql-js/running-an-express-graphql-server/
 
 ## Prerequisites
 
-Before getting started, you should have Node v6 installed, although the examples should mostly work in previous versions of Node as well. For this guide, we won't use any language features that require transpilation, but we will use some ES6 features like [Promises](http://www.html5rocks.com/en/tutorials/es6/promises/), [classes](http://javascriptplayground.com/blog/2014/07/introduction-to-es6-classes-tutorial/), and [fat arrow functions](https://strongloop.com/strongblog/an-introduction-to-javascript-es6-arrow-functions/), so if you aren't familiar with them you might want to read up on them first.
+Before getting started, you should have Node v6 installed, although the examples should also work in previous versions of Node as well. For this guide, we won't use any language features that require transpilation, but we will use some ES6 features like [Promises](http://www.html5rocks.com/en/tutorials/es6/promises/), [classes](http://javascriptplayground.com/blog/2014/07/introduction-to-es6-classes-tutorial/), and [fat arrow functions](https://strongloop.com/strongblog/an-introduction-to-javascript-es6-arrow-functions/), so if you aren't familiar with them you might want to read up on them first.
 
 To create a new project and install GraphQL.js in your current directory: