Update CONTRIBUTING.md

Fixed relative link per 0dcba27#commitcomment-67331343 cc @skyl

Author: cmcclister

CONTRIBUTING.md

@@ -2,7 +2,7 @@
 
 Thank you for taking the time to contribute to the Microsoft Azure documentation.
 
-This guide covers some general topics related to contribution and refers to the [contributors guide](/contribute) for more detailed explanations when required.
+This guide covers some general topics related to contribution and refers to the [contributors guide](https://docs.microsoft.com/contribute) for more detailed explanations when required.
 
 ## Code of Conduct
 
@@ -25,4 +25,4 @@ Follow the guidance for [Quick edits to existing documents](/contribute/#quick-e
 
 ### Pull Request
 
-Review the guidance for [Pull Requests](/contribute/how-to-write-workflows-major#pull-request-processing) in our contributors guide.
+Review the guidance for [Pull Requests](/contribute/how-to-write-workflows-major#pull-request-processing) in our contributors guide.