website: improve hardware-notes-processor.rb

[vladlen]

Summary

1. Revert the part of the patch https://reviews.freebsd.org/D57133

remove warnings from the hardware.adoc text - following the comment
https://reviews.freebsd.org/D57257#inline-339310

2. Add the code to replace FreeBSD version in hardware.adoc header

from sys/conf/newvers.sh to avoid additional manual work.

[cperciva]

Looks good to me. I assume you've tested it?

And thanks for the version-number fix too. I have some sed for this but since we're running a script on the file anyway it makes sense to do it here.

[vladlen]

In D57262#1312511, @cperciva wrote:

Looks good to me. I assume you've tested it?

Yes, I have tested it. It works with releng, stable and main branches.