GPII-1682:  Removed misleading information about the `next` argument used in the `errorMiddleware` grade's `middleware` invoker.
GPII-1682:  Removed misleading information about the `next` argument used in the `errorMiddleware` grade's `middleware` invoker.

the-t-in-rtf/gpii-express,the-t-in-rtf/gpii-express,GPII/gpii-express,GPII/gpii-express