runtime(compiler): add vimdoc Commit: https://github.com/vim/vim/commit/fcbefe74f1619dfd925033d83a6d233c686409d4 Author: Wu, Zhenyu <wuzhenyu@ustc.edu> Date: Thu Apr 11 21:25:39 2024 +0200 runtime(compiler): add vimdoc closes: https://github.com/vim/vim/issues/14459 https://github.com/google/vimdoc generates vim help files from vimscript files Signed-off-by: Wu, Zhenyu <wuzhenyu@ustc.edu> Signed-off-by: Christian Brabandt <cb@256bit.org>