code: public CertificateDescriptionInner get(String resourceGroupName, String resourceName, String certificateName) {
          return getWithServiceResponseAsync(resourceGroupName, resourceName, certificateName).toBlocking().single().body();
      }
docs: Get the certificate.
  Returns the certificate.
  
  @param resourceGroupName The name of the resource group that contains the IoT hub.
  @param resourceName The name of the IoT hub.
  @param certificateName The name of the certificate
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws ErrorDetailsException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the CertificateDescriptionInner object if successful.