bug#37141: 27.0.50; spelling doesn't work in XML comments

[Eli Zaretskii]

> Date: Thu, 22 Aug 2019 16:15:01 +0200
> From: Vincent Lefevre <vincent@vinc17.net>
> Cc: 37141@debbugs.gnu.org
> 
> (defcustom ispell-skip-html 'use-mode-name
>   "Indicates whether ispell should skip spell checking of SGML markup.
> If t, always skip SGML markup; if nil, never skip; if non-t and non-nil,
> guess whether SGML markup should be skipped according to the name of the
> buffer's major mode."
> [...]
> 
> "SGML markup" does not make any sense in XML. Here, that seems to
> be XML comments (XML markup, e.g. tags, attribute names, and even
> attribute values, is skipped in all cases, which is what is expected,
> IMHO).

I fixed the doc string to be more detailed.

Thanks.