swipldcgtut
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Update hyperlink to DCG basics doc page
Was: http://www.swi-prolog.org/pldoc/doc/swi/library/dcg/basics.pl which is now an access denied error.
Update to a Google search result: http://www.swi-prolog.org/pldoc/doc/SWI/library/dcg/basics.pl which looks right enough to be useful.