runtime(doc): clarify that a umask is applied to mkdir()

Commit: 
https://github.com/vim/vim/commit/0a336ccb57003c44ba303ccc50cf50cb640c2309
Author: Christian Brabandt <c...@256bit.org>
Date:   Tue Mar 11 21:14:31 2025 +0100

    runtime(doc): clarify that a umask is applied to mkdir()
    
    fixes: https://github.com/vim/vim/issues/16849
    
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 80b8a9cc4..ec1088933 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 23
+*builtin.txt*  For Vim version 9.1.  Last change: 2025 Mar 11
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -7587,9 +7587,8 @@ mkdir({name} [, {flags} [, {prot}]])                      
*mkdir()* *E739*
                If {prot} is given it is used to set the protection bits of
                the new directory.  The default is 0o755 (rwxr-xr-x: r/w for
                the user, readable for others).  Use 0o700 to make it
-               unreadable for others.  This is only used for the last part of
-               {name}.  Thus if you create /tmp/foo/bar then /tmp/foo will be
-               created with 0o755.
+               unreadable for others.  This is used for the newly created
+               directories.  Note an umask is applied to {prot} (on Unix).
                Example: >
                        :call mkdir($HOME .. "/tmp/foo/bar", "p", 0o700)
 

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