merge most recent portmdoc into a̲l̲l̲ of its users; fixup .\& into \&. like

in mksh(1), for Schillix ditroff

lksh.1

@@ -1,6 +1,6 @@
-.\" $MirOS: src/bin/mksh/lksh.1,v 1.16 2015/12/12 22:25:14 tg Exp $
+.\" $MirOS: src/bin/mksh/lksh.1,v 1.17 2016/02/11 20:12:09 tg Exp $
 .\"-
-.\" Copyright (c) 2008, 2009, 2010, 2012, 2013, 2015
+.\" Copyright (c) 2008, 2009, 2010, 2012, 2013, 2015, 2016
 .\"	mirabilos <m@mirbsd.org>
 .\"
 .\" Provided that these terms and disclaimer and all copyright notices
@@ -27,7 +27,9 @@
 .\" * ^ is size-reduced and placed atop in groff, so use \*(ha
 .\" * \(en does not work in nroff, so use \*(en
 .\" * <>| are problematic, so redefine and use \*(Lt\*(Gt\*(Ba
-.\" Also make sure to use \& especially with two-letter words.
+.\" Also make sure to use \& *before* a punctuation char that is to not
+.\" be interpreted as punctuation, and especially with two-letter words
+.\" but also (after) a period that does not end a sentence (“e.g.\&”).
 .\" The section after the "doc" macropackage has been loaded contains
 .\" additional code to convene between the UCB mdoc macropackage (and
 .\" its variant as BSD mdoc in groff) and the GNU mdoc macropackage.
@@ -72,7 +74,7 @@
 .\" with -mandoc, it might implement .Mx itself, but we want to
 .\" use our own definition. And .Dd must come *first*, always.
 .\"
-.Dd $Mdocdate: December 12 2015 $
+.Dd $Mdocdate: February 11 2016 $
 .\"
 .\" Check which macro package we use, and do other -mdoc setup.
 .\"