Start worker mgmt docs (supervisord)
s/php/PHP
Use FQCN as service names for jobs

Since bug #85 it is not possible to use non FQCN for jobs as service
names. First that bug must be fixed then the docs can be reverted.
Change line break to fit code part on one line
s/Doctrin/Doctrine
Fetch job manager from queue

Don't inject the job manager anymore, since it's already available from
the queue which is injected anyhow. This simplifies the constructor
arguments from the job itself and makes it more readable.