Fix a typo.

Debian bug:	#302663
Submitted by:	A Costa <agcosta@gis.net>

--- a/xmahjongg.6
+++ b/xmahjongg.6
@@ -311,7 +311,7 @@
 .PP
 The default tileset was originally created in color by Dorothy Robinson
 <mokuren@teleport.com> with Mark A. Holm <markh@aracnet.com>. The
-publically available version was in black-and-white. Holm copyrighted the
+publicly available version was in black-and-white. Holm copyrighted the
 tiles in 1988, giving permission to copy and distribute for non-profit
 purposes. The significantly altered color version that comes with
 .B xmahjongg