runtime(vim): don't set compiler, update a comment for vimdoc compiler (#14532)

Signed-off-by: shane.xb.qian <shane.qian@foxmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/ftplugin/vim.vim b/runtime/ftplugin/vim.vim
index e28beb9..67f360b 100644
--- a/runtime/ftplugin/vim.vim
+++ b/runtime/ftplugin/vim.vim
@@ -1,7 +1,7 @@
 " Vim filetype plugin
 " Language:		Vim
 " Maintainer:		Doug Kearns <dougkearns@gmail.com>
-" Last Change:		2024 Apr 08
+" Last Change:		2024 Apr 13
 " Former Maintainer:	Bram Moolenaar <Bram@vim.org>
 
 " Only do this when not done yet for this buffer
@@ -15,8 +15,6 @@
 let s:cpo_save = &cpo
 set cpo&vim
 
-compiler vimdoc
-
 if !exists('*VimFtpluginUndo')
   func VimFtpluginUndo()
     setl fo< isk< com< tw< commentstring< include< define<