update graphql() function.

graphql function is generating null schema error in passing paramter as its taking a obj parameter

Author: daniyaniazi

src/content/graphql-js/APIReference-GraphQL.md

@@ -144,12 +144,14 @@ var { graphql } = require('graphql'); // CommonJS
 
 ```js
 graphql(
+{
   schema: GraphQLSchema,
   requestString: string,
   rootValue?: ?any,
   contextValue?: ?any,
   variableValues?: ?{[key: string]: any},
   operationName?: ?string
+  }
 ): Promise<GraphQLResult>
 ```