[OpenRISC] [PATCH v3 1/4] reggroups: Add test and docs for `info reg $reggroup` feature

[Eli Zaretskii <eliz@gnu.org>]

> From: Stafford Horne <shorne@gmail.com>
> Cc: Openrisc <openrisc@lists.librecores.org>,	Stafford Horne <shorne@gmail.com>
> Date: Tue, 19 Dec 2017 23:22:54 +0900
> 
> Until now this feature has existed but was not documented.  Adding docs
> and tests.

Thanks!

> + at item info registers @var{reggroup} @dots{}
> +Print the name and value of the registers in each of the specified
> + at var{reggroup}.  The @var{reggoup} can be any of those returned by

Please use "@var{reggroup}s", with the trailing "s", otherwise this is
not correct English.

> + at code{maint print reggroups}.

Please add here a cross-reference to the node where "maint print
reggroups" is described.

>    c = add_info ("registers", info_registers_command, _("\
>  List of integer registers and their contents, for selected stack frame.\n\
> -Register name as argument means describe only that register."));
> +Register name as argument means describe only that register.\n\
> +Register group name as argument means describe the registers in the\n\
> +named register group."));

Since this command accepts more than one reggroup, I think the doc
string should mention that.

The documentation parts are okay with these nits fixed.