DOCS-2710: fix bad link

Author: Sam Kleinman

source/core/backups.txt

@@ -95,7 +95,7 @@ For more information, see the
 :doc:`/tutorial/backup-sharded-cluster-with-filesystem-snapshots` for
 complete instructions on using LVM to create snapshots. Also see
 :ecosystem:`Back up and Restore Processes for MongoDB on Amazon EC2
-</tutorial/backup-and-restore-mongodb-on-amazon-EC2>`.
+</tutorial/backup-and-restore-mongodb-on-amazon-ec2>`.
 
 .. _backup-with-mongodump: