Minor copy edits

Changed the case of "Users". Edited the final paragraph for grammar.

Author: d-laing

site/learn/Introduction.md

@@ -11,7 +11,7 @@ next: /learn/queries/
 
 GraphQL is a query language for your API, and a server-side runtime for executing queries by using a type system you define for your data. GraphQL isn't tied to any specific database or storage engine and is instead backed by your existing code and data.
 
-A GraphQL service is created by defining types and fields on those types, then providing functions for each field on each type. For example, a GraphQL service that tells us who the logged in user is (`me`) as well as that User's name might look something like this:
+A GraphQL service is created by defining types and fields on those types, then providing functions for each field on each type. For example, a GraphQL service that tells us who the logged in user is (`me`) as well as that user's name might look something like this:
 
 ```graphql
 type Query {
@@ -58,4 +58,4 @@ Could produce the JSON result:
 }
 ```
 
-Learn more about GraphQL: the query language, type system, how the GraphQL service works, and as well as best practices for using GraphQL to solve common problems in the articles written in this section.
+Learn more about GraphQL—the query language, type system, how the GraphQL service works, as well as best practices for using GraphQL to solve common problems—in the articles written in this section.