Update link for tips on how to get faster reviews (#2997)

Kubernetes merged guides, and this is now the current location of guide

Author: techknowlogick

CONTRIBUTING.md

@@ -110,7 +110,7 @@ pull request workflow to do that. And, we also use [LGTM](http://lgtm.co)
 to ensure every PR is reviewed by at least 2 maintainers.
 
 Please try to make your pull request easy to review for us. And, please read 
-the *[How to get faster PR reviews](https://github.com/kubernetes/community/blob/master/contributors/devel/faster_reviews.md)* guide;
+the *[How to get faster PR reviews](https://github.com/kubernetes/community/blob/master/contributors/devel/pull-requests.md#best-practices-for-faster-reviews)* guide;
 it has lots of useful tips for any project you may want to contribute.
 Some of the key points: