Miscellaneous doc formatting

* put all server arguments in backtick quotes, so they don't get turned into en-dashes
* `<code></code>` blocks on command line, so it stays in line with text

Also fixed some Python desired capabilities, and added one missed PHP sample.
Hmm. This means there is no way to make it readable in Slate and in Github. Slate pulls everything triple backticked into the sidebar.