Add a conductor considerations section

Add a small section in the conductor docs about
the cycling issue and give some resolutions that
can be applied as well as link to the better solution
which is garbage collection for jobs that are not
working out.

Also includes some tiny tweaks to other docs.

Change-Id: I73e9f8f5a8888eaf967d62723f6ffb45b02887c9
Merge "Add a conductor considerations section"