Update security polling status for Debian and derivatives

Current versions.
update index of documentation add documentation documentation (yo)
Add IPv6 hints for {b,c}.root-servers.net
Fix some wording, some style and a typo
fix another style issue in the docs about the docs
Add IPv6 examples with ports to forward-zone

Closes #1515
Use documentation subnets for examples

  Also, change some use of doamin names to example.{com,net,org}
I accidentally a word
Remove the use of hos' as a DNS tool (Closes #996)

Also, clarify that you're not supposed to type it into the monitor
window.
Merge pull request #1899 from pieterlexis/b-c-root-hints

Add IPv6 hints for {b,c}.root-servers.net
Merge pull request #1902 from pieterlexis/use-example-ip-blocks

Use documentation subnets for examples
Merge pull request #1903 from pieterlexis/issue-996

Remove the use of hos' as a DNS tool (Closes #996)
docs: Note first version which had also-notify in pdns.conf
Merge pull request #1904 from zeha/doc-also-notify

docs: Note first version which had also-notify in pdns.conf
Fix another typo, caught by @habbie
Merge pull request #1901 from pieterlexis/issue-1515

Add IPv6 examples with ports to forward-zone
Merge pull request #1900 from pieterlexis/wording-fix

Fix some wording, some style and a typo
this si somewhat of a kamikaze commit - it fixes my problem, and I think it should not break anyone else.
clarify docs
Merge branch 'master' of github.com:PowerDNS/pdns