bug#49691: `brew cask install` should be `brew install --cask` (Emacs website)

[tsuucat]

current Emacs website[1] says `brew cask install emacs` as install
command on MacOS but `brew cask ...` is now deprecated[2].
`brew install --cask emacs` should be used instead of `brew cask
install emacs`.

I've now updated the page (following admin/notes/www), but I guess
somebody on the gnu.org side has to actually trigger an update of the
web site?

Thanks for your quick response!

I accessed https://www.gnu.org/software/emacs/download.html and I

confirmed the website updated.

Thanks again.

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tsuu32