bug#8352: 24.0.50; `apropos-command' output: lines too long

[Chong Yidong]

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

> The output from `apropos-command', like help output generally, needs to
> be filled to column 70.  Currently, there seems to be no limit to the
> line length.
>
> The long lines come not from the doc, which is already correctly
> adjusted, but from long lists of key bindings, particularly long menu
> bindings.

Fair enough.  I added some code to fill it.