message: vim-plug directions
diff: Syntax Plugin for Text Editors
  ==============================
  -There is a [Vim][] syntax highlighting plugin for Bril's text format available in `bril-vim`.
  +There is a [Vim][] syntax highlighting plugin for Bril's text format available in `bril-vim`. You can use it with a Vim plugin manager. For example, if you use [vim-plug][], you can add this to your `.vimrc`:
  +
  + Plug 'sampsyo/bril', { 'for': 'bril', 'rtp': 'bril-vim' }
  You can read [more about the plugin][blog], which is originally by Edwin Peguero.
  [vim]: https://www.vim.org
  [blog]: https://www.cs.cornell.edu/courses/cs6120/2019fa/blog/vim-syntax-highlighting/
  +[vim-plug]: https://github.com/junegunn/vim-plug
  