vim: Rename "augroup END" to "augroup end" (cosmetics).
vim: Rename "augroup END" to "augroup end" (cosmetics).

"augroup END" and "augroup end" have the same meaning. This commit just unifies
the use of "END" vs "end".

s3rvac/dotfiles,s3rvac/dotfiles,s3rvac/dotfiles