[iagno] Update man page.

[Michael Catanzaro <mcatanzaro src gnome org>]

commit cee9b78f893361b1f513bee9990682adb4cabc9c
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Mon Jul 21 07:32:22 2014 +0200

    Update man page.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=733478

 data/iagno.6 |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)
---
diff --git a/data/iagno.6 b/data/iagno.6
index 200aa31..cd41062 100644
--- a/data/iagno.6
+++ b/data/iagno.6
@@ -30,6 +30,22 @@ your own color.
 .TP
 .B \-f, \-\-fast\-moves
 Play with reduced delay before the computer moves.
+.PP
+.B \-\-first
+.br
+.B \-\-second
+.br
+.B \-\-two-players
+.RS 7
+Sets the game mode (for the next play if already playing).
+.br
+The options --first and --second are for a one-player game,
+where the player plays respectively first and second.
+.br
+The option --two-players is for a two-players game mode.
+.br
+You should only use one of these options at the same time.
+.RE
 .TP
 .B \-h, \-\-help
 Prints the command line options and exits.