bug#10253: mention +FORMAT in ls time style reminder help blurb

[Paul Eggert]

I like the change, thanks.  A couple of nits:

On 12/11/11 03:07, Jim Meyering wrote:
> +              fprintf (stderr,
> +                       _("  - `+' followed by a date format string\n"));

I suggest supplying an example and quoting "date" so that it's clearer
that it's talking about the `date' command.  Something like this, perhaps?

   _("  - +FORMAT (e.g., +%H:%M) for a `date'-style format\n")

> +                fprintf (stderr, "  - `[posix-]%s'\n", *p++);

I suggest removing the ` and ' since they are locale-dependent
and aren't needed here (plus, that works better with the above
suggestion....).

> +              fprintf (stderr, _("Valid arguments are:"));

Isn't the usual style to use fputs when there's no directive
in the format?  There's one other example of this.