Bug#919082: debian-policy: website has old FHS version

[Jeremy Bicha <jbicha@debian.org>]

Source: debian-policy
Version: 4.3.0.1

At the end of
https://www.debian.org/doc/debian-policy/ch-opersys.html#file-system-hierarchy
there is a link named FHS (Debian copy) pointing to
https://www.debian.org/doc/packaging-manuals/fhs/

but that is the FHS 2.3 version and Debian Policy in that same section
(§9.1.1) says that Debian follows FHS 3.0.

I see that the Debian package for debian-policy does install the 3.0
version, so it's just the website that needs to be updated.

Thanks,
Jeremy Bicha