See QTBUG-58277. No longer report missing parameter names when processing the \fn command, because there are cases where they are not required. This is an over-simplification of the problem, but it works for now.

In the future, we may want to distinguish between cases where the parameter type is std::nullptr_t, which means the actual parameter is null, and the case where some type is provided without a name, which indicates that the parameter is not used in this implementation of the function.