[patch] correct some make-variable defaults

[Joachim Henke <free.software%gmx.com@localhost>]

I found that a few defaults in doc/BUILDING.mdoc and
share/man/man5/mk.conf.5 are wrongly documented. The attached patch
brings them in sync with share/mk/bsd.own.mk.

Best regards,
Jo.

Index: share/man/man5/mk.conf.5
===================================================================
RCS file: /cvsroot/src/share/man/man5/mk.conf.5,v
retrieving revision 1.69
diff -u -r1.69 mk.conf.5
--- share/man/man5/mk.conf.5	25 Mar 2014 10:23:26 -0000	1.69
+++ share/man/man5/mk.conf.5	7 Apr 2015 11:47:12 -0000
@@ -27,7 +27,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd March 25, 2014
+.Dd April 7, 2015
 .Dt MK.CONF 5
 .Os
 .\" turn off hyphenation
@@ -262,7 +262,7 @@
 .YorN
 Indicates whether preformatted plaintext manual pages will be created
 and installed.
-.DFLTy
+.DFLTn
 .
 .It Sy MKCLEANSRC
 .YorN
@@ -1053,11 +1053,10 @@
 .Dq XFree86 .
 Only relevant if
 .Sy MKX11!=no .
-.Pp
-.Em Default :
-.Dq Xorg
-on alpha, i386, macppc, shark and sparc64 platforms.
+.DFLT
 .Dq XFree86
+on acorn32, alpha, amiga, mac68k, pmax, and sun3 platforms,
+.Dq Xorg
 on everything else.
 .
 .El
Index: doc/BUILDING.mdoc
===================================================================
RCS file: /cvsroot/src/doc/BUILDING.mdoc,v
retrieving revision 1.111
diff -u -r1.111 BUILDING.mdoc
--- doc/BUILDING.mdoc	8 Jan 2015 23:59:26 -0000	1.111
+++ doc/BUILDING.mdoc	7 Apr 2015 11:47:12 -0000
@@ -33,7 +33,7 @@
 .\" Toolchain prefix for commands
 .ds toolprefix nb
 .
-.Dd August 7, 2014
+.Dd April 7, 2015
 .Dt BUILDING 8
 .Os NetBSD
 .
@@ -783,9 +783,9 @@
 or
 .Dq XFree86 .
 .DFLT
-.Dq Xorg
-on amd64, i386, macppc, shark and sparc64 platforms,
 .Dq XFree86
+on acorn32, alpha, amiga, mac68k, pmax, and sun3 platforms,
+.Dq Xorg
 on everything else.
 .
 .El