runtime(doc): remove buffer-local completeopt todo item

has already implemented by @zeertzjq  on https://github.com/vim/vim/pull/14922

closes: #16152

Signed-off-by: glepnir <glephunter@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/todo.txt b/runtime/doc/todo.txt
index 2f18654..e73d2f1 100644
--- a/runtime/doc/todo.txt
+++ b/runtime/doc/todo.txt
@@ -1,4 +1,4 @@
-*todo.txt*      For Vim version 9.1.  Last change: 2024 Oct 27
+*todo.txt*      For Vim version 9.1.  Last change: 2024 Dec 02
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -4749,7 +4749,6 @@
     (Prabir Shrestha, 2017 May 19, #1713)
 -   When 'completeopt' has "noselect" does not insert a newline.
     (Lifepillar, 2017 Apr 23, #1653)
--   Can 'completeopt' be made buffer-local? (#5487)
 -   When complete() first argument is before where insert started and
     'backspace' is Vi compatible, the completion fails.
     (Hirohito Higashi, 2015 Feb 19)