Add more filetypes to Closetag and change spellcheck mapping.
Add more filetypes to Closetag and change spellcheck mapping.

Specifically this will activate Closetag when editing `.xml` files,
whereas before it was looking for `.xhtml` only.

The `]s` motion will move to the next misspelled, rare, or wrong region
word. `]S` (note the capitalization) only stops at wrong words.

deoxys314/deoxys314_dotfiles