Update nfs.md with a new link since old one is 404-ing

doc/administration/high_availability/nfs.md

@@ -103,8 +103,7 @@ If you do choose to use EFS, avoid storing GitLab log files (e.g. those in `/var
 there because this will also affect performance. We recommend that the log files be
 stored on a local volume.
 
-For more details on another person's experience with EFS, see
-[Amazon's Elastic File System: Burst Credits](https://rawkode.com/2017/04/16/amazons-elastic-file-system-burst-credits/)
+For more details on another person's experience with EFS, see this [Commit Brooklyn 2019 video](https://youtu.be/K6OS8WodRBQ?t=313).
 
 ## Avoid using CephFS and GlusterFS