Enhanced abbreviations with :Abolish

Vim's built-in abbreviation feature is handy if you want to auto-correct words that you frequently misspell, but it requires a lot of setup. The `:Abolish` command makes it easy to generate abbreviations that will correct multiple forms of the same word.

*This is the final of a three-part series on Tim Pope’s [abolish] plugin.*

[abolish]: https://github.com/tpope/vim-abolish