9718 update mandoc to 1.14.4

@@ -1,9 +1,9 @@
-.\"     $Id: roff.7,v 1.94 2017/07/05 12:25:17 schwarze Exp $
+.\"     $Id: roff.7,v 1.96 2018/04/10 00:52:30 schwarze Exp $
 .\"
 .\" Copyright (c) 2010, 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
-.\" Copyright (c) 2010,2011,2013-2015,2017 Ingo Schwarze <schwarze@openbsd.org>
+.\" Copyright (c) 2010-2018 Ingo Schwarze <schwarze@openbsd.org>
 .\"
 .\" Permission to use, copy, modify, and distribute this software for any
 .\" purpose with or without fee is hereby granted, provided that the above
 .\" copyright notice and this permission notice appear in all copies.
 .\"

@@ -13,11 +13,11 @@
 .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: July 5 2017 $
+.Dd $Mdocdate: April 10 2018 $
 .Dt ROFF 5
 .Os
 .Sh NAME
 .Nm roff
 .Nd roff language reference for mandoc

@@ -1346,11 +1346,11 @@
 Temporarily turn off line numbering.
 Currently unsupported.
 .It Ic \&nop Ar body
 Execute the rest of the input line as a request or macro line.
 Currently unsupported.
-.It Ic \&nr Ar register Oo Cm + Ns | Ns Cm - Oc Ns Ar expression
+.It Ic \&nr Ar register Oo Cm + Ns | Ns Cm - Oc Ns Ar expression Op Ar stepsize
 Define or change a register.
 A register is an arbitrary string value that defines some sort of state,
 which influences parsing and/or formatting.
 For the syntax of
 .Ar expression ,

@@ -1358,10 +1358,18 @@
 .Sx Numerical expressions
 below.
 If it is prefixed by a sign, the register will be
 incremented or decremented instead of assigned to.
 .Pp
+The
+.Ar stepsize
+is used by the
+.Ic \en+
+auto-increment feature.
+It remains unchanged when omitted while changing an existing register,
+and it defaults to 0 when defining a new register.
+.Pp
 The following
 .Ar register
 is handled specially:
 .Bl -tag -width Ds
 .It Cm nS

@@ -1469,11 +1477,11 @@
 Change post-vertical spacing.
 This is a groff extension and currently ignored.
 .It Ic \&rchar Ar glyph ...
 Remove glyph definitions.
 Currently unsupported.
-.It Ic \&rd Op Ar prompt Op Ar agument ...
+.It Ic \&rd Op Ar prompt Op Ar argument ...
 Read from standard input.
 Currently ignored.
 .It Ic \&recursionlimit Ar maxrec maxtail
 Set the maximum stack depth for recursive macros.
 This is a Heirloom extension and currently ignored.

@@ -1994,17 +2002,23 @@
 .No \em( Ns Ar cc .
 .Ss \eN\(aq Ns Ar number Ns \(aq
 Character
 .Ar number
 on the current font.
-.Ss \en Ns Bq Ar name
+.Ss \en Ns Oo +|- Oc Ns Bq Ar name
 Interpolate the number register
 .Ar name .
 For short names, there are variants
 .No \en Ns Ar c
 and
 .No \en( Ns Ar cc .
+If the optional sign is specified,
+the register is first incremented or decremented by the
+.Ar stepsize
+that was specified in the relevant
+.Ic \&nr
+request, and the changed value is interpolated.
 .Ss \eo\(aq Ns Ar string Ns \(aq
 Overstrike, writing all the characters contained in the
 .Ar string
 to the same output position.
 In terminal and HTML output modes,