code: public LabInner update(String resourceGroupName, String labAccountName, String labName, LabFragment lab) {
          return updateWithServiceResponseAsync(resourceGroupName, labAccountName, labName, lab).toBlocking().single().body();
      }
docs: Modify properties of labs.
  
  @param resourceGroupName The name of the resource group.
  @param labAccountName The name of the lab Account.
  @param labName The name of the lab.
  @param lab Represents a lab.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the LabInner object if successful.