Updated documentation.  Currently at the section 'Optional inputs for implicit stage solves' in User_callable.rst.
Updated documentation.  Currently at the section 'Optional inputs for implicit stage solves' in User_callable.rst.

liuqx315/Sundials,liuqx315/Sundials,liuqx315/Sundials,liuqx315/Sundials,liuqx315/Sundials,liuqx315/Sundials