fix qsg order.

Author: dushaniw

en/mkdocs.yml

@@ -71,8 +71,8 @@ nav:
     - Home: index.md
     - Get Started:
           - Introduction: get-started/overview.md
-          - Quick Start Guide: get-started/api-manager-quick-start-guide.md         
           - Key Concepts: get-started/key-concepts.md
+          - Quick Start Guide: get-started/api-manager-quick-start-guide.md         
           - Architecture: get-started/apim-architecture.md
           - Deployment Options:
               - Deployment Platforms: get-started/deployment-platforms.md