Add why statement to file locking

doc/user/project/file_lock.md

@@ -2,9 +2,9 @@
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/440) in [GitLab Premium](https://about.gitlab.com/pricing/) 8.9.
 
-File Locking helps you avoid merge conflicts and better manage your binary files.
-Lock any file or directory, make your changes, and then unlock it so another
-member of the team can edit it.
+Working with multiple people on the same file can be a risk. Conflicts when merging a non-text file are hard to overcome and will require a lot of manual work to resolve.  File Locking helps you avoid these merge conflicts and better manage your binary files.
+
+With File Locaking, you can lock any file or directory, make your changes, and then unlock it so another member of the team can edit it.
 
 ## Overview