updated SPARQL(Update)Store's docstrings with recommendations to use Dataset instead of ConjunctiveGraph
updated SPARQL(Update)Store's docstrings with recommendations to use Dataset instead of ConjunctiveGraph

RDFLib/rdflib,armandobs14/rdflib,marma/rdflib,RDFLib/rdflib,marma/rdflib,dbs/rdflib,armandobs14/rdflib,armandobs14/rdflib,dbs/rdflib,dbs/rdflib,avorio/rdflib,yingerj/rdflib,marma/rdflib,RDFLib/rdflib,avorio/rdflib,armandobs14/rdflib,yingerj/rdflib,ssssam/rdflib,dbs/rdflib,ssssam/rdflib,avorio/rdflib,yingerj/rdflib,ssssam/rdflib,yingerj/rdflib,marma/rdflib,RDFLib/rdflib,avorio/rdflib,ssssam/rdflib