runtime(doc): mention :argded for :argedit

related: #14464

Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: chrisbra

runtime/doc/editing.txt

@@ -1,4 +1,4 @@
-*editing.txt*   For Vim version 9.1.  Last change: 2024 Apr 11
+*editing.txt*   For Vim version 9.1.  Last change: 2024 Apr 12
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -658,8 +658,8 @@ list of the current window.
 
 :[count]arge[dit][!] [++opt] [+cmd] {name} ..		*:arge* *:argedit*
 			Add {name}s to the argument list and edit it.
-			When {name} already exists in the argument list, this
-			entry is edited.
+			There is no check for duplicates, it is possible to
+			add a file to the argument list twice |:argded|.
 			This is like using |:argadd| and then |:edit| (with
 			the small exception that |:edit| does not change the
 			argument list, so the argument list pointer isn't