[jdom-interest] Type in JavaDoc for Entity.

[Jools Enticknap]

The JavaDoc for public Entity setContent(String textContent) reads;

If this <code>Entity</code> will have both textual content
and nexted elements, <code>{@link #setMixedContent}</code> 
should be used instead,

I'm guessing that nexted needs to be replaces with nested ?

--Jools