add USAGE section with docs on errors to MongoDB::Database
add USAGE section with docs on errors to MongoDB::Database

xdg/mongo-perl-driver,mongodb/mongo-perl-driver,mongodb/mongo-perl-driver,dagolden/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,jorol/mongo-perl-driver,mongodb/mongo-perl-driver,xdg/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,kainwinterheart/mongo-perl-driver,xdg/mongo-perl-driver,jorol/mongo-perl-driver,dagolden/mongo-perl-driver,kainwinterheart/mongo-perl-driver,rahuldhodapkar/mongo-perl-driver,gormanb/mongo-perl-driver,jorol/mongo-perl-driver,jorol/mongo-perl-driver,gormanb/mongo-perl-driver,gormanb/mongo-perl-driver,kainwinterheart/mongo-perl-driver,kainwinterheart/mongo-perl-driver,dagolden/mongo-perl-driver,gormanb/mongo-perl-driver,dagolden/mongo-perl-driver