Update intro.rst
Update intro.rst

String vs variable.
nicolewhite/py2neo,fpieper/py2neo,fpieper/py2neo,fpieper/py2neo,technige/py2neo,technige/py2neo,technige/py2neo,nicolewhite/py2neo,nigelsmall/py2neo,nigelsmall/py2neo,nicolewhite/py2neo