Clarify tutorial
Clarify tutorial

Also adds hyperlinks to documentation of methods discussed.

xdg/mongo-perl-driver,xdg/mongo-perl-driver,dagolden/mongo-perl-driver,dagolden/mongo-perl-driver,mongodb/mongo-perl-driver,mongodb/mongo-perl-driver,dagolden/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,mongodb/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,xdg/mongo-perl-driver,dagolden/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver