Clarify that mixed types should not be passed to jQuery constructor

[brandwaffle]

Pertains to: http://api.jquery.com/jQuery/

User Reported:
The page documents:
jQuery( elementArray )
elementArray -- An array containing a set of DOM elements to wrap in a jQuery object.

However, as far as I can see, elementArray may also contain jQuery objects. This is a nice feature. It would be nice if it was documented!

Dev Summit Notes:
Dave: incorrect assumption, however, it should be documented that passing jquery objects in the element array will cause them to be double-wrapped. Such a child node would be singularly unloved - it would be an orphan forever, never to be adopted - it would live a life of dickensian tragedy. Add docs saying NEVER PASS ANYTHING BUT DOM ELEMENTS via elementArray