Update Contribution docs with non-404 link (#4077)

CONTRIBUTING.md

@@ -114,7 +114,7 @@ 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/pull-requests.md#best-practices-for-faster-reviews)* guide;
+the *[How to get faster PR reviews](https://github.com/kubernetes/community/blob/261cb0fd089b64002c91e8eddceebf032462ccd6/contributors/guide/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: