bug#23258: 25.1.50; The docstring of with-eval-after-load needs improvement

[Drew Adams]

> > Your quick closing coincided with my reply.  There is more to
> > this than just what was mentioned in the bug report.  Do you
> > want me to file a separate bug report with the feedback I
> > provided to this one?
> 
> Separate bug, of course.  It has nothing to do with this one.

Done - bugs #23262 and #23264.