code: @Override
      public ModifyVpcTenancyResult modifyVpcTenancy(ModifyVpcTenancyRequest request) {
          request = beforeClientExecution(request);
          return executeModifyVpcTenancy(request);
      }
docs: <p>
  Modifies the instance tenancy attribute of the specified VPC. You can change the instance tenancy attribute of a
  VPC to <code>default</code> only. You cannot change the instance tenancy attribute to <code>dedicated</code>.
  </p>
  <p>
  After you modify the tenancy of the VPC, any new instances that you launch into the VPC have a tenancy of
  <code>default</code>, unless you specify otherwise during launch. The tenancy of any existing instances in the
  VPC is not affected.
  </p>
  <p>
  For more information, see <a
  href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/dedicated-instance.html">Dedicated Instances</a> in the
  <i>Amazon Elastic Compute Cloud User Guide</i>.
  </p>
  
  @param modifyVpcTenancyRequest
  @return Result of the ModifyVpcTenancy operation returned by the service.
  @sample AmazonEC2.ModifyVpcTenancy
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/ec2-2016-11-15/ModifyVpcTenancy" target="_top">AWS API
  Documentation</a>