runtime(doc): clarify {special} argument for shellescape()

Commit: 
https://github.com/vim/vim/commit/5faeb60480c6efba5c0468c01275120b6ace5a09
Author: Enno <konf...@users.noreply.github.com>
Date:   Wed May 15 21:54:19 2024 +0200

    runtime(doc): clarify {special} argument for shellescape()
    
    closes: https://github.com/vim/vim/issues/14770
    
    Signed-off-by: Enno <konf...@users.noreply.github.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index b37170ce7..edc018fe7 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -1,4 +1,4 @@
-*builtin.txt*  For Vim version 9.1.  Last change: 2024 May 07
+*builtin.txt*  For Vim version 9.1.  Last change: 2024 May 15
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -8991,11 +8991,12 @@ shellescape({string} [, {special}])                     
*shellescape()*
                Otherwise it will enclose {string} in single quotes and
                replace all "'" with "'\''".
 
-               When the {special} argument is present and it's a non-zero
-               Number or a non-empty String (|non-zero-arg|), then special
-               items such as "!", "%", "#" and "<cword>" will be preceded by
-               a backslash.  This backslash will be removed again by the |:!|
-               command.
+               The {special} argument adds additional escaping of keywords
+               used in Vim commands. When it is not omitted and a non-zero
+               number or a non-empty String (|non-zero-arg|), then special 
+               items such as "!", "%", "#" and "<cword>" (as listed in 
+               |expand()|) will be preceded by a backslash. 
+               This backslash will be removed again by the |:!| command.
 
                The "!" character will be escaped (again with a |non-zero-arg|
                {special}) when 'shell' contains "csh" in the tail.  That is

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