Clarify error message when container name is already in use. Signed-off-by: Gustav Sinder <gustav.sinder@gmail.com>

Signed-off-by: gs11 <gustav.sinder@gmail.com>

daemon/daemon.go

@@ -396,7 +396,7 @@ func (daemon *Daemon) reserveName(id, name string) (string, error) {
 		} else {
 			nameAsKnownByUser := strings.TrimPrefix(name, "/")
 			return "", fmt.Errorf(
-				"Conflict. The name %q is already in use by container %s. You have to delete (or rename) that container to be able to reuse that name.", nameAsKnownByUser,
+				"Conflict. The name %q is already in use by container %s. You have to remove (or rename) that container to be able to reuse that name.", nameAsKnownByUser,
 				stringid.TruncateID(conflictingContainer.ID))
 		}
 	}