Add docs about when locks can panic
Add docs about when locks can panic

Add a note to the locks when panics will occur.

Signed-off-by: Sascha Grunert <70ab469ddb2ac3e35f32ed7c2fd1cca514b2e879@suse.com>

containers/storage,containers/storage,rhatdan/storage,containers/storage,rhatdan/storage,rhatdan/storage