doc: changed section for man pages from 1x to 1

As pointed by Douglas Torrance, nowadays no application is using anymore
the 1x section for the man pages, so this patch is changing the section for
all our concerned man pages to 1 (general commands).

Took opportunity to add some missing references in "see also" sections.

Reported-by: Doug Torrance <dtorrance@monmouthcollege.edu>
Signed-off-by: Christophe CURIS <christophe.curis@free.fr>

doc/wmaker.in

@@ -1,5 +1,5 @@
 .\" Hey, Emacs!  This is an -*- nroff -*- source file.
-.TH "Window Maker" 1x "February 2015"
+.TH "Window Maker" 1 "February 2015"
 .SH NAME
 wmaker \- X11 window manager with a NEXTSTEP look
 .SH SYNOPSIS
@@ -63,7 +63,7 @@ display Window Maker's version number and exit
 .TP
 .B \-\-visual\-id
 specify the ID of the visual to use; see
-.BR xdpyinfo (1x)
+.BR xdpyinfo (1)
 for a list of visuals available in your display
 .PP
 .SH FILES
@@ -150,16 +150,19 @@ The Window Maker User Guide
 .PP
 The Window Maker FAQ
 .PP
-.BR X (1x),
-.BR wdwrite (1x),
-.BR wxcopy (1x),
-.BR geticonset (1x),
-.BR seticons (1x),
-.BR wmaker (1x),
-.BR wxpaste (1x),
-.BR getstyle (1x),
-.BR setstyle (1x),
-.BR wmsetbg (1x)
+.BR WPrefs (1),
+.BR X (7),
+.BR wxcopy (1),
+.BR wxpaste (1),
+.BR geticonset (1),
+.BR seticons (1),
+.BR getstyle (1),
+.BR setstyle (1),
+.BR wmsetbg (1),
+.BR wmgenmenu (1),
+.BR wmmenugen (1),
+.BR wdread (1),
+.BR wdwrite (1)
 .SH AUTHOR
 Window Maker was written by Alfredo K. Kojima <kojima@windowmaker.info>,
 Dan Pascu <dan@windowmaker.info> with contributions from many people around