bug#24386: 24.5; `read--expression' --> `read-expression', please

[Lars Ingebrigtsen]

Drew Adams <drew.adams@oracle.com> writes:

> Please consider renaming `read--expression' to `read-expression' and
> taking away its "internal" designation.  What it does is equally useful
> to ordinary Emacs user-programmers.

It does seem like a rather internal function (setting up eldoc stuff and
the like), so I think it's probably well-named as is; closing.

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