Improve the wording of how sessions commit changes.
('fred', 'Fred Flinstone', 'blah')
COMMIT
-:meth:`~.Session.commit` flushes whatever remaining changes remain to the
+:meth:`~.Session.commit` flushes the remaining changes to the
database, and commits the transaction. The connection resources referenced by
the session are now returned to the connection pool. Subsequent operations
with this session will occur in a **new** transaction, which will again