Added beta banner to API ref
Added beta banner to API ref

tableau/webdataconnector,RiversideCAPaulD/tableau-test,jpherron/kbwdc,tableau/webdataconnector,RiversideCAPaulD/tableau-test,Jurr32/wdc-test,Jurr32/wdc-test,Jurr32/wdc-test,RiversideCAPaulD/tableau-test,jpherron/kbwdc,jpherron/kbwdc