Re: [PATCH v5] doc: highlight that .gitmodules does not support !command

> From: Petar Vutov <pvutov@imap.cc>
>
> Bugfix for fc01a5d2 (submodule update documentation: don't repeat
> ourselves, 2016-12-27).
>
> The `custom command` and `none` options are described as sharing the
> same limitations, but one is allowed in .gitmodules and the other is
> not.
>
> Rewrite the description for custom commands to be more precise,
> and make it easier for readers to notice that custom commands cannot
> be used in the .gitmodules file.
>
> Signed-off-by: Petar Vutov <pvutov@imap.cc>
> ---
> Combines the custom command description rewrite by Junio C Hamano and
> my proposed changes into a single patch.