Update README with edits

README.md

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-This guide walks you through creating a "hello world" [RESTful web service][u-rest] with Spring.
+This guide walks you through the process of creating a "hello world" [RESTful web service][u-rest] with Spring.
 
 What you'll build
 -----------------
 
-The service will accept HTTP GET requests at:
+You'll build a service that will accept HTTP GET requests at:
 
     http://localhost:8080/greeting