Style guide additions

[cbscribe]

We need a standard for writing arguments. Looking at the docs and recent PRs now, I see:

• argument
• 'argument'
• "argument"
• [i]argument[/i]
• [code]argument[/code]

[NathanLovato]

'argument' is the one I've seen the most. I wish it was markdown and we could use ``, as bbcode is less convenient to write, and more importantly edit. I'd go with [code] as it's code, after all. What do you think?

[cbscribe]

I agree. [code] is the way I did it in all my docs.

[cbscribe]

This version has diverged from the updated one in your PR. We probably shouldn't link people here anymore.