patch for minor documentation errors

[Dave Kemper]

Below is a patch to fix some minor errors in the groff documentation.
I created this patch against the 1.22.2 release.  What it fixes:

 - The man page's descriptions of .tm and .tm1 say they send text to
stdout; in fact, they both use stderr, as the info manual documents.

 - The documentation for the -me macro .$H says it is "called at the
top of each page"; it is actually called at the top of each column.

 - The info manual example for the dn and dl registers concludes with both
a .rr @s and a .rm @s.  The latter is unnecessary because the example code
never defined @s as a macro, diversion, or string, only as a register.

I also see that my previous documentation patch, which
I submitted in Dec 2011, is not in the 1.22.2 code.  (See
http://lists.gnu.org/archive/html/groff/2011-12/msg00053.html for
details.)  Was there a problem with this patch?



--- doc/groff.info-2.orig       2013-02-07 06:06:21.000000000 -0600
+++ doc/groff.info-2    2013-09-21 03:50:28.000000000 -0500
@@ -1391,7 +1391,6 @@
           .  br
           .  fi
           .  rr @s
-          .  rm @s
           .  rm @c
           ..
           .\" End of macro definitions, restore escape mechanism
--- doc/meref.me.orig   2013-02-07 06:06:11.000000000 -0600
+++ doc/meref.me        2013-09-21 03:47:21.000000000 -0500
@@ -714,11 +714,12 @@
 (after putting out
 the header,
 initial saved floating keeps,
-etc.);
+etc.),
+or each column when in two-column mode;
 in other words,
 this macro is called immediately before
 printing text
-on a page.
+on a page or in a column.
 It can be used for column headings
 and the like.
 .sh 1 "Displays"
--- man/groff.man.orig  2013-02-07 06:06:08.000000000 -0600
+++ man/groff.man       2013-09-21 03:39:16.000000000 -0500
@@ -2397,13 +2397,13 @@
 .REQ .tm "anything"
 Print
 .I anything
-on stdout.
+on stderr.
 .
 .TPx
 .REQ .tm1 "anything"
 Print
 .I anything
-on stdout, allowing leading whitespace if
+on stderr, allowing leading whitespace if
 .I anything
 starts with
 \&\f[CB]\[dq]\f[]
@@ -2548,7 +2548,7 @@
 for an overview) or from a preprocessor.
 .
 .P
-Preprocessor macros are easy to be recognized.
+Preprocessor macros are easily recognized.
 .
 They enclose their code into a pair of characteristic macros.
 .