Bug#840334: ring-daemon: Fix client package name in man page.

[Oleksandr Gavenko]

Package: ring-daemon
Version: 20160901.1.204c604~dfsg2-2+b1
Severity: normal

dring(1) has sentence:

  You need to install a client to use the daemon, for instance GTK+ client,
  ring-client-gnome.

Debian package archive uses ``gnome-ring`` name for GUI client (from ``ring``
package).

Please fix name in order to point to actual executable/package.

-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (990, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.5.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

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