runtime(doc): add reference to extendnew() at extend()

Commit: 
https://github.com/vim/vim/commit/5647c91355f1ff3a1030c737bf5133bb7da5bb76
Author: Christian Brabandt <c...@256bit.org>
Date:   Mon Feb 17 21:33:30 2025 +0100

    runtime(doc): add reference to extendnew() at extend()
    
    related: https://github.com/vim/vim/issues/16607
    
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index e2d2f43b5..344dfdfd8 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -1,4 +1,4 @@
-*builtin.txt*  For Vim version 9.1.  Last change: 2025 Feb 06
+*builtin.txt*  For Vim version 9.1.  Last change: 2025 Feb 17
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -3006,7 +3006,8 @@ extend({expr1}, {expr2} [, {expr3}])                      
*extend()*
                When {expr3} is omitted then "force" is assumed.
 
                {expr1} is changed when {expr2} is not empty.  If necessary
-               make a copy of {expr1} first.
+               make a copy of {expr1} first or use |extendnew()| to return a
+               new List/Dictionary.
                {expr2} remains unchanged.
                When {expr1} is locked and {expr2} is not empty the operation
                fails.

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