public Method returnDesc(int index, String name, String desc) {
        returnName[index] = name;
        returnDesc[index] = desc;
        return this;
    }
Describe a return value of this method. This adds documentation
that can be obtained through remote reflection.

@return this Method, to allow chaining
@param index the return value index
@param name the return value name
@param desc the return value description
jrt/src/com/yahoo/jrt/Method.java