Adds parentheses around prints in documentation
Adds parentheses around prints in documentation

This makes the docstring example code compatible with both Python 2 and Python 3.
sqlalchemy/sqlalchemy,zzzeek/sqlalchemy,j5int/sqlalchemy,wujuguang/sqlalchemy,monetate/sqlalchemy,sandan/sqlalchemy,wujuguang/sqlalchemy,j5int/sqlalchemy,robin900/sqlalchemy,graingert/sqlalchemy,sandan/sqlalchemy,robin900/sqlalchemy,graingert/sqlalchemy,bdupharm/sqlalchemy,bdupharm/sqlalchemy,monetate/sqlalchemy