Move '--push-peer-info' documentation from 'server' to 'client options'

Move '--push-peer-info' documentation from 'server' to 'client options'

While --push-peer-info can be configured on the server, it's not really
intended for that, and it ended in the "SERVER OPTIONS" section by
mishap.  Fix that.

Reported-by: Stella Ashburne <rewefie@gmx.com>
Signed-off-by: Gert Doering <gert@greenie.muc.de>
Acked-by: Frank Lichtenheld <frank@lichtenheld.com>
Message-Id: <20211207130436.22187-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg23325.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>