code: public ModifyDBInstanceRequest withDBSecurityGroups(String... dBSecurityGroups) {
          if (this.dBSecurityGroups == null) {
              setDBSecurityGroups(new com.amazonaws.internal.SdkInternalList<String>(dBSecurityGroups.length));
          }
          for (String ele : dBSecurityGroups) {
              this.dBSecurityGroups.add(ele);
          }
          return this;
      }
docs: <p>
  A list of DB security groups to authorize on this DB instance. Changing this setting doesn't result in an outage
  and the change is asynchronously applied as soon as possible.
  </p>
  <p>
  Constraints:
  </p>
  <ul>
  <li>
  <p>
  If supplied, must match existing DBSecurityGroups.
  </p>
  </li>
  </ul>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setDBSecurityGroups(java.util.Collection)} or {@link #withDBSecurityGroups(java.util.Collection)} if you
  want to override the existing values.
  </p>
  
  @param dBSecurityGroups
  A list of DB security groups to authorize on this DB instance. Changing this setting doesn't result in an
  outage and the change is asynchronously applied as soon as possible.</p>
  <p>
  Constraints:
  </p>
  <ul>
  <li>
  <p>
  If supplied, must match existing DBSecurityGroups.
  </p>
  </li>
  @return Returns a reference to this object so that method calls can be chained together.