code: @Override
      public UpdateKeyDescriptionResult updateKeyDescription(UpdateKeyDescriptionRequest request) {
          request = beforeClientExecution(request);
          return executeUpdateKeyDescription(request);
      }
docs: <p>
  Updates the description of a customer master key (CMK). To see the decription of a CMK, use <a>DescribeKey</a>.
  </p>
  <p>
  You cannot perform this operation on a CMK in a different AWS account.
  </p>
  <p>
  The result of this operation varies with the key state of the CMK. For details, see <a
  href="http://docs.aws.amazon.com/kms/latest/developerguide/key-state.html">How Key State Affects Use of a
  Customer Master Key</a> in the <i>AWS Key Management Service Developer Guide</i>.
  </p>
  
  @param updateKeyDescriptionRequest
  @return Result of the UpdateKeyDescription operation returned by the service.
  @throws NotFoundException
  The request was rejected because the specified entity or resource could not be found.
  @throws InvalidArnException
  The request was rejected because a specified ARN was not valid.
  @throws DependencyTimeoutException
  The system timed out while trying to fulfill the request. The request can be retried.
  @throws KMSInternalException
  The request was rejected because an internal exception occurred. The request can be retried.
  @throws KMSInvalidStateException
  The request was rejected because the state of the specified resource is not valid for this request.</p>
  <p>
  For more information about how key state affects the use of a CMK, see <a
  href="http://docs.aws.amazon.com/kms/latest/developerguide/key-state.html">How Key State Affects Use of a
  Customer Master Key</a> in the <i>AWS Key Management Service Developer Guide</i>.
  @sample AWSKMS.UpdateKeyDescription
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/kms-2014-11-01/UpdateKeyDescription" target="_top">AWS API
  Documentation</a>