…rror check; clean up some docs
…lasses. =end/=back directives now pass an attribute hash ref, similar to the hash ref passed in all _handle_element_start() calls, to _handle_element_end(). This allows subclasses to see if there exists a key 'fake-closer' which would signify that Pod::Simple generated the closing directive and it is not really present in the POD source. Pod::Simple::Methody has been updated to pass the hash ref through too.
… error checks
The nested =begins are now correctly closed so that Pod::Simple knows to start caring about the POD instead of thinking it was still inside a =begin block. The space in the nested L<>s is removed to avoid the trailing whitespace error from being reported.