Fix comment for metadata/db.go
Fix comment for metadata/db.go

Fix comment

Signed-off-by: Taeho Nam <c4993291e611723a7f439fc21bb4a0da83aeaac9@gmail.com>
containerd/containerd,containerd/containerd,thaJeztah/containerd,estesp/containerd,thaJeztah/containerd,mikebrow/containerd,mikebrow/containerd,estesp/containerd