Document implications of reference counting on DOM node destruction.
Document implications of reference counting on DOM node destruction.

svn path=/trunk/dom/; revision=3444

dunkelstern/libdom,Achal-Aggarwal/libdom,Achal-Aggarwal/libdom,prepare/netsurf_libdom,dunkelstern/libdom,Achal-Aggarwal/libdom,dunkelstern/libdom,prepare/netsurf_libdom,Achal-Aggarwal/libdom,dunkelstern/libdom,dunkelstern/libdom,prepare/netsurf_libdom,prepare/netsurf_libdom,Achal-Aggarwal/libdom,prepare/netsurf_libdom,prepare/netsurf_libdom,dunkelstern/libdom,Achal-Aggarwal/libdom