Add User Interactions section to Miscellaneous.

How about giving a specific example instead, like:
> To limit the output to the last 10 logins, use:
> ```
> last -10
> ```

I think people will get the point from that. It's not clear from this whether `num` is literal or intended to be substituted. Another possibility is using [the samp role](http://sphinx-doc.org/markup/inline.html#role-samp).