fix man page typo (#22)

Author: x2w-soda

xwm.1

@@ -79,7 +79,7 @@ No known bugs.
 .SH AUTHOR
 Michael Czigler <michaelczigler[at]mcpcpc[dot]com>
 .SH "SEE ALSO"
-.BR livxcb (1),
+.BR libxcb (1),
 .BR st (1),
 .BR surf (1),
 .BR dmenu (1)