bug#3717: M-x man completion

[Kevin Ryde]

Juri Linkov <juri@jurta.org> writes:
>
> But then you don't see additional information about section names that
> may help to select the necessary manual.

You mean on a unique name, like say "gunzip"?  I wasn't terribly
interested in the section number as a suffix if it's unique.  Omitting
it makes for a cleaner list; and it could be a bit confusing if the bare
name is present for duplicated pages but not present for unique ones.
But perhaps it's personal preference.