bug#19116: 25.0.50; doc string of `eval-expression'

[Drew Adams <drew.adams@oracle.com>]

> > The first doc-string line should say what the command does
> > interactively:
> >
> >   Read a Lisp expression, evaluate it, and print the value in the echo area.
> >   ^^^^                    ^^^^             ^^^^^
> 
> That's exactly what it says, just in fewer words.

Nope.  2 out of 3.

It does not tell you that you are asked to input
an expression to evaluate.

I'm not inventing anything here, and it seems like you are
just being defensive about this.  This is the way we document
commands, as I'm sure you know.  We tell users that they will
be prompted for this and that, and we tell them what the
command does with what they enter.

I'm done with this.