Clarify that super class must also use annotations

The page http://maven.apache.org/plugin-tools/maven-plugin-plugin/examples/using-annotations.html says:

"NOTE With annotations, it's not any more mandatory to have your Mojos super classes in the same project. Super classes can now come from reactor projects or external dependencies."

It would help if were made explicit that this will only work if the super-class also uses annotations. Something like:

"NOTE With annotations, your Mojo super class does not have to be in the same project. Provided that the super class also uses annotations, it
can now come from reactor projects or external dependencies."