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.
When I view this rendered as markdown, it all shows up on one line as an in-line code block. Do we need `pre` instead?

I think the preferred way to do this is with the triple-backtick + language name, like \`\`\`bash