US2807 - Add docs that explain how to configure Pulp to work with a given broker config.

The intent of this story is about configuring Pulp to work with a given broker config, and not about configuring the broker for a given config. Assuming the user has a specific Qpid or RabbitMQ installation in place, this guide can tell them how to do the Pulp portion.

I originally wrote the settings for the [task] section, so I can vouch for their correctness. I believe the [messaging] section is correct, but I had to read up on those settings, along with some notes I got from @jortel.

One known gap is that it doesn't talk much about the rpm installation for Qpid transport. I have a future PR planned that is going to fill that gap through the creation of a new groupinstall command. That is considered separate work.

I also fixed a few docs errors that were causing warnings and errors. With this PR docs built from scratch will experience no syntax errors or warnings.
I agree having them in two places is not a great idea. I've merged the docs I wrote and the inline docs that were already there in these sections for server.conf and consumer.conf. This PR has been adjusted to refer to the inline docs in those config files. Changed with daa0db3dce017cae89e44a91e62a5aa89e1ae96b