doc/jedi-vim.txt: retab with expandtab
doc/jedi-vim.txt: retab with expandtab

Fixes https://github.com/davidhalter/jedi-vim/issues/437.
Closes https://github.com/davidhalter/jedi-vim/pull/487.

genzj/jedi-vim,FBruynbroeck/jedi-vim,davidhalter/jedi-vim