obsolete manpages (approx is not invoked by inetd by default (but by systemd) and approx-gc not found)

[Dima]

1) Ubuntu Artful Aardvark 17.10
2) approx 5.8-1ubuntu2
3) I wanted to know how it works by typing man approx
4) All works, but the manpages are definitely obsolete.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: approx 5.8-1ubuntu2 [modified: lib/systemd/system/approx.socket]
ProcVersionSignature: Ubuntu 4.13.0-12.13-generic 4.13.3
Uname: Linux 4.13.0-12-generic x86_64
ApportVersion: 2.20.7-0ubuntu2
Architecture: amd64
CurrentDesktop: LXDE
Date: Fri Oct 6 23:08:39 2017
InstallationDate: Installed on 2017-09-29 (7 days ago)
InstallationMedia: Lubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170926)
SourcePackage: approx
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.approx.approx.conf: 2017-09-29T22:47:45.070606