document port syntax

[cjellick]

show all the different forms port syntax can take in the CLI.

We agreed that @ibuildthecloud would just document in the normal CLI help and @cloudnautique can figure out how to carry that forward into the rest of the docs

[cjellick]

I need to add the syntax to the CLI

[cloudnautique]

We did this right before launch: https://docs.acorn.io/running/networking#publish-individual-ports

[cjellick]

Moving into v0.2.0 to address the CLI bit

[cjellick]

Going to close and leave it as just the documentation until someone complains.