Revise Siren documentation (#6553)

* revise Siren doc

* Fix broken links

* Fix broken links

* broken links

* mdlint

* mdlint

* mdlint again

* Merge branch 'unstable' into book-siren

* test whether I have the required privs :-)

* revise

* some minor siren related changes for the book

* updates re: `--net=host`

* lint

* Minor revision

* Add note

* mdlint

* Merge branch 'unstable' into book-siren

* Merge branch 'unstable' into book-siren

* Merge remote-tracking branch 'origin/unstable' into book-siren

* Fix spellcheck

* Capital letters SSL

wordlist.txt

@@ -194,7 +194,6 @@ rc
 reimport
 resync
 roadmap
-runtime
 rustfmt
 rustup
 schemas