Link update proposal for en_US.ISO8859-1/articles/contributing

[ebrandi]

Summary

While doing the review of this article translation to pt_BR I tested the
links at the resource section, and saw that two of the links was doing a
http redirect to new urls:

Link at PR Database:

FROM: https://www.FreeBSD.org/cgi/query-pr-summary.cgi?query
TO: https://bugs.freebsd.org/bugzilla/query.cgi

Link at Poudriere resource:

FROM: https://fossil.etoilebsd.net/poudriere/
TO: https://github.com/freebsd/poudriere

Than i`m proposing that we update these URLs in the article to avoid the
need of doing this redirect :)

I also saw that the Portsmon website listed at resource section are not
working, by the error message it apear to be disable since october 2017.

Any link at http://portsmon.freebsd.org/ , return the following message:

"The latest Python updated failed. Repairs are in progress 20171025 -- mcl"

Since i don't work with ports i don't know if there is any replacement for
this tool, do we need to update this url or do we need to update the article
to remove the references to portmon?

Test Plan

Just visit the links in the article to confirm that it are redirecting the
user to a new url.

[bjk]

These look like fine content changes, but double-check the indentation in line 1182 (i.e., tabs vs. spaces).

Hopefully linimon can speak to portsmon.

[ebrandi]

Thks bjk, i will double check the indentation.

[linimon]

if I can ever get my life back on track, portsmon will return.