defaults.vim: Update comment to simplify reverting augroup

Commit: 
https://github.com/vim/vim/commit/c41b3c9f95ac57646804977edea496705618cc93
Author: Balki <[email protected]>
Date:   Fri Jul 14 16:59:40 2023 +0000

    defaults.vim: Update comment to simplify reverting augroup
    
    closes: https://github.com/vim/vim/issues/12673

diff --git a/runtime/defaults.vim b/runtime/defaults.vim
index 9b4ecfeaf..67659895f 100644
--- a/runtime/defaults.vim
+++ b/runtime/defaults.vim
@@ -97,7 +97,7 @@ if 1
   filetype plugin indent on
 
   " Put these in an autocmd group, so that you can revert them with:
-  " ":augroup vimStartup | exe 'au!' | augroup END"
+  " ":autocmd! vimStartup"
   augroup vimStartup
     au!
 
@@ -115,7 +115,7 @@ if 1
   " Quite a few people accidentally type "q:" instead of ":q" and get confused
   " by the command line window.  Give a hint about how to get out.
   " If you don't like this you can put this in your vimrc:
-  " ":augroup vimHints | exe 'au!' | augroup END"
+  " ":autocmd! vimHints"
   augroup vimHints
     au!
     autocmd CmdwinEnter *

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