extraAllowedContent documentation correction

[Matthew Leffler]

​http://docs.ckeditor.com/#!/api/CKEDITOR.config-cfg-extraAllowedContent

           // Editor contents will be:
            '<h1>Foo</h1><p><b>Bar</b> foo</p>'

This is incorrect since the docs state that 'b i' are allowed via extraAllowedContent. The behavior is correct, only the docs are incorrect.

The correct contents are

'<h1><i>Foo</i></h1><p><b>Bar</b> foo</p>'

[Piotrek Koszuliński]

Thanks. In fact, we've got this corrected in repo, but we haven't uploaded new docs build yet.