runtime(doc): get rid of the titlestring hack for terminal-api

Commit: 
https://github.com/vim/vim/commit/14e8208d8432df86828830b3798553f99bedb333
Author: Christian Brabandt <c...@256bit.org>
Date:   Sat Feb 22 13:35:15 2025 +0100

    runtime(doc): get rid of the titlestring hack for terminal-api
    
    fixes: https://github.com/vim/vim/issues/16656
    
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/doc/terminal.txt b/runtime/doc/terminal.txt
index 53e2dcd08..1d502abc9 100644
--- a/runtime/doc/terminal.txt
+++ b/runtime/doc/terminal.txt
@@ -1,4 +1,4 @@
-*terminal.txt* For Vim version 9.1.  Last change: 2025 Feb 13
+*terminal.txt* For Vim version 9.1.  Last change: 2025 Feb 22
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1092,11 +1092,11 @@ Currently supported commands:
                Example in JSON: >
                        ["drop", "path/file.txt", {"ff": "dos"}]
 
-A trick to have Vim send this escape sequence: >
-       exe "set t_ts=\<Esc>]51; t_fs=\x07"
-       let &titlestring = '["call","Tapi_TryThis",["hello",123]]'
-       redraw
-       set t_ts& t_fs&
+You can use |echoraw()| to make Vim send this escape sequence: >
+       call echoraw("\<ESC>]51;[\"call\", \"Tapi_TryThis\", [\"hello\", 
123]]\x07")
+       call echoraw("\<Esc>]51;[\"drop\", \"README.md\"]\x07")
+Note: JSON requires double quotes around string values, hence those have to be
+escaped.
 
 Rationale: Why not allow for any command or expression?  Because that might
 create a security problem.

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