handbook: Improve Firewalls chapter

[dbaio]

Summary

I've found these issues when translating this chapter to pt_BR.

handbook: Improve Firewalls chapter

- Fix some dead links and punctuations.
- pfctl_parser.c was moved to a new location since FreeBSD 10
- Fix service name for starting spamlogd

Test Plan

Results of these diffs:
handbook_firewalls-concepts
handbook_firewalls-pf
handbook_firewalls-ipfw

[bcr]

One comment on the service start command.

en_US.ISO8859-1/books/handbook/firewalls/chapter.xml

1476 ↗

(On Diff #53251)

Isn't it
service obspamlogd start
instead?

[dbaio]

en_US.ISO8859-1/books/handbook/firewalls/chapter.xml

1476 ↗

(On Diff #53251)

Yes, you've found this and another two similar issues. =)
Fixed.

[bcr]

Approved for commit. Can you do that yourself? Thanks for the work!

[dbaio]

In D18981#405902, @bcr wrote:

Approved for commit. Can you do that yourself? Thanks for the work!

Sure, thanks for the review.