code: public com.google.api.ads.admanager.axis.v201811.OperatingSystemTargeting getOperatingSystemSegment() {
          return operatingSystemSegment;
      }
docs: Gets the operatingSystemSegment value for this ProductSegmentation.
  
  @return operatingSystemSegment   * The operating system segmentation. {@link OperatingSystemTargeting#isTargeted}
  must be {@code true}.
  We only allow segment by Operating_System, not Operating_System_Version
  (will be ignored).
  
  <p>This attribute is optional.