docs(cookbook/graphql): @kapunahelewong review of review fixes

Author: Urigo

public/docs/ts/latest/cookbook/graphql.jade

@@ -219,11 +219,9 @@ a#http-heroes
     The full documentation can be found on the [Apollo Client docs website](http://dev.apollodata.com/).
 
 :marked
-  The starting point for the app would be the Tour Of Heroes tutorial app at it's end state.
-  You can download that app [here](https://github.com/johnpapa/angular2-tour-of-heroes/archive/master.zip).
-
-  You will gradually migrate that app from using REST to using GraphQL.
+  The starting point for the app is the [Tour of Heroes tutorial](https://github.com/johnpapa/angular2-tour-of-heroes/archive/master.zip) app at its end state.
 
+  This guide shows you how to migrate that app from REST to GraphQL.
 
 .l-main-section
 <a id="installation"></a>
@@ -470,8 +468,8 @@ code-example(language="sh" class="code-shell").
 
 +makeExample('heroes-graphql/ts/src/app/in-memory-graphql.ts', 'graphql-schema', 'in-memory-graphql.ts')
 :marked
-  The schema starts with a representions of the model of data the server exposes. 
-  Then the schema specifies what queries are allowed on that data, followed by specifing 
+  The schema starts with a represention of the model of data the server exposes. 
+  Then the schema specifies what queries are allowed on that data, followed by specifying 
   what mutations (actions) clients are allowed to do on the server.
   The end of the schema provides the above definitions as the root types the GrpahQL server will expose.
 
@@ -538,15 +536,15 @@ code-example(language="sh" class="code-shell").
 :marked
   Now create a new `networkInterface` class and call it `InBrowserNetworkInterface`.
 
-  This class will have a `schema` property which it will initialize in the constructor.
+  This class has a `schema` property which it will initializes in the constructor.
 
   Next, the `query` function takes as an argument the query request and executes 
   that query using the GraphQL `execute` function against the schema property.
 
   You send empty objects to the `rootValue` and `contextValue` arguments of the function with `{}` and `{}` respectively 
   and send the `variables` and `operationName` arguments that are related to the query request.
 
-  Lastly export the new `InBrowserNetworkInterface` class in order to import it to Apollo Client.
+  Lastly, export the new `InBrowserNetworkInterface` class in order to import it to Apollo Client.
 +makeExample('heroes-graphql/ts/src/app/in-memory-graphql.ts', 'execute-and-export', 'in-memory-graphql.ts (excerpt)')
 :marked
   Now all that's left is to connect the new in-memory server to the Apollo Client configuration