Change the recommended first line? (was: texinfo should support Emacs coding specifier)

[Mathieu Lirzin]

Hi,

In the texinfo manual we can read this:

--8<---------------cut here---------------start------------->8---
Every Texinfo file that is to be the top-level input to TeX must begin
with a line that looks like this:

     \input texinfo   @c -*-texinfo-*-
--8<---------------cut here---------------end--------------->8---

Since Emacs uses texinfo mode automatically when opening a '.texi' file.
I would like to know if it still makes sense to recommend declaring the
mode this way.

IMO it would improve clarity to remove such recommandation in the
examples and only document this feature in a specific place, like what
is done in the Org mode manual:

  http://orgmode.org/manual/Activation.html

WDYT?

--
Mathieu Lirzin