bug#69387: 30.0.50; A string shouldn't be both a docstring and a return value

[Stefan Monnier]

> Here again we are changing age-old (mis)features, which some code
> somewhere probably relies upon.  Why? because a newly-introduced
> byte-compilation warning erroneously flagged that as a mistake in the
> doc string.
>
> My vote is to leave this alone.

There is no benefit to this misfeature.
Leaving this alone will maintain a low-level of pain for the
foreseeable future.  Fixing it may introduce minor breakage (like
`C-h m` saying there's no docstring) in the short term but these are
easy to fix and they'll disappear quickly.


        Stefan