Adjust capitalization in sidebar

SIDEBAR.md

 
 ### Getting Started Guides
 
-* [Consuming RESTful web services][gs-consuming-rest]
+* [Consuming RESTful Web Services][gs-consuming-rest]
 * [Building a Hypermedia Driven REST Web Service][gs-rest-hateoas]
-* [Consuming RESTful web services on Android][gs-consuming-rest-android]
-* [Consuming XML from a RESTful Web Service on Android][gs-consuming-rest-xml-android]
-* [Building a RESTful web service with Bootstrap Actuator][gs-actuator-service]
+* [Consuming RESTful Web Services on Android][gs-consuming-rest-android]
+* [Consuming XML From a RESTful Web Service on Android][gs-consuming-rest-xml-android]
+* [Building a RESTful Web Service with Bootstrap Actuator][gs-actuator-service]
 
 [gs-consuming-rest]: /guides/gs/consuming-rest/content
 [gs-consuming-rest-android]: /guides/gs/consuming-rest-android/content