[PATCH 1 of 2] copy: correct synopsis by making SOURCE a required argument

[Yuya Nishihara]

On Wed, 03 Jul 2019 10:08:19 +0800, Anton Shestakov wrote:
> # HG changeset patch
> # User Anton Shestakov <av6 at dwimlabs.net>
> # Date 1562119311 -28800
> #      Wed Jul 03 10:01:51 2019 +0800
> # Node ID 9151cf680e05ebe7322388f25af3376f52e004a8
> # Parent  e3df1e15bee9d70d6cc4697e503091a7bff0f8fc
> copy: correct synopsis by making SOURCE a required argument

Queued for stable, thanks.