runtime(doc): clarify the help style a bit

Commit: 
https://github.com/vim/vim/commit/5268b95150d99b560178ed361079c16c3d4c59f6
Author: Christian Brabandt <[email protected]>
Date:   Sun Jan 25 17:58:30 2026 +0000

    runtime(doc): clarify the help style a bit
    
    related: https://github.com/vim/vim/issues/19250
    
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/runtime/doc/helphelp.txt b/runtime/doc/helphelp.txt
index c014e558c..a020c0ea0 100644
--- a/runtime/doc/helphelp.txt
+++ b/runtime/doc/helphelp.txt
@@ -1,4 +1,4 @@
-*helphelp.txt* For Vim version 9.1.  Last change: 2025 Dec 02
+*helphelp.txt* For Vim version 9.1.  Last change: 2026 Jan 25
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -418,8 +418,9 @@ STYLE
 If your Vim has 'modeline' enabled, Vim should follow the preferred style
 automatically when editing built-in help files.
 
-Vim help files should be formatted for a 'textwidth' of 78 characters, so they
-look good in a typical 80 x 24 terminal window.
+Vim help files should be formatted for a 'textwidth' of 78 characters (with
+'conceal' enabled), so they look good in a typical 80 x 24 terminal window;
+use `:set colorcolumn=+0` as a visual guide.
 
 Use two spaces between the final dot of a sentence of the first letter of the
 next sentence.  Like this.

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