code: public DescribeSeverityLevelsResult withSeverityLevels(SeverityLevel... severityLevels) {
          if (this.severityLevels == null) {
              setSeverityLevels(new com.amazonaws.internal.SdkInternalList<SeverityLevel>(severityLevels.length));
          }
          for (SeverityLevel ele : severityLevels) {
              this.severityLevels.add(ele);
          }
          return this;
      }
docs: <p>
  The available severity levels for the support case. Available severity levels are defined by your service level
  agreement with AWS.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setSeverityLevels(java.util.Collection)} or {@link #withSeverityLevels(java.util.Collection)} if you want
  to override the existing values.
  </p>
  
  @param severityLevels
  The available severity levels for the support case. Available severity levels are defined by your service
  level agreement with AWS.
  @return Returns a reference to this object so that method calls can be chained together.