Differentiate between sensu-plugin gem and the sensu-plugins

[jaxxstorm]

At the moment, there are two different things referred to as sensu-plugin.

There's the sensu-plugin framework which is required for stuff to work, and there's a parameter for it.

Then there's the sensu-plugin(s) which are optional scripts from from the community and such like. This is covered by a defined type

The documentation for these parameters isn't clear enough in my opinion and we need to ensure that people know the difference when reading the parameters list.

[jlambert121]

Yeah, the documentation could probably use some clarity there. When it was last modified it was before the sensu plugin gems existed. How about taking a whack at it?