bug#40725: 27.0.91; Tutorial reports false positive key rebindings

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: Eli Zaretskii <eliz@gnu.org>,  40725@debbugs.gnu.org
> Date: Fri, 24 Apr 2020 00:52:52 +0300
> 
> The problem is that a Greek tutorial when added to a file with the .el
> extension in etc/tutorials/TUTORIAL.el will be visited in Emacs Lisp mode.
> 
> Out of curiosity, I checked other tutorials, and indeed the problem exists:
> the Swedish tutorial etc/tutorials/TUTORIAL.sv is visited in Verilog mode.

File-local variables should be able to fix that, don't they?