Update Guides-ConstructingTypes.md (graphql#223)

Removed repeat of the start of the sentence.

Author: grantcarthew

site/graphql-js/Guides-ConstructingTypes.md

@@ -8,7 +8,7 @@ next: /graphql-js/express-graphql/
 
 For many apps, you can define a fixed schema when the application starts, and define it using GraphQL schema language. In some cases, it's useful to construct a schema programmatically. You can do this using the `GraphQLSchema` constructor.
 
-When you are using the `GraphQLSchema` constructor to create a schema, instead of defining `Query` and `Mutation` types solely using schema language, you create them as separate object types using the `GraphQLObjectType` constructor.
+When you are using the `GraphQLSchema` constructor to create a schema, instead of defining `Query` and `Mutation` types solely using schema language, you create them as separate object types.
 
 For example, let's say we are building a simple API that lets you fetch user data for a few hardcoded users based on an id. Using `buildSchema` we could write a server with: