Ending `def caveats` with `puts <<-EOS` causes text to be printed whenever the
formula is imported (which confuses the output of things like `brew audit`). A
plain `<<-EOS` should be used.
ClosesHomebrew/homebrew#7303.
This reverts commit 32dfc2dfd7a2dcf1c2c1552cfe383af655592682.
Formula installs files outside of the Homebrew prefix, specifically to
`~/.emacs.d/auctex`.