bug#36529: Docs say font-lock-mode should be on by default

[Eli Zaretskii]

> From: 積丹尼 Dan Jacobson
>  <jidanni@jidanni.org>
> Date: Sat, 06 Jul 2019 21:44:50 +0800
> 
> (info "(emacs) Font Lock") says
> 
>    Font Lock mode is enabled by default.
> 
> $ emacs -q --no-site-file
> C-h v font-lock-mode
> 
> font-lock-mode is a variable defined in ‘font-core.el’.
> Its value is nil

That's fine, and isn't a bug.  The buffer where you do this doesn't
support font-lock.