code: public DocServiceBuilder exampleRequest(Object... exampleRequests) {
          requireNonNull(exampleRequests, "exampleRequests");
          return exampleRequest(ImmutableList.copyOf(exampleRequests));
      }
docs: Adds the example requests which are applicable to the method denoted by the specified example requests.
  Please note that this method may fail if the specified requests object do not provide the information
  about their service and method names.
  
  @throws IllegalArgumentException if failed to get the service and method name from an example request