Fix grammar in `traceback.html` (#17942)
Fix grammar in `traceback.html` (#17942)

`those` -> `these`
bolkedebruin/airflow,lyft/incubator-airflow,Acehaidrey/incubator-airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,bolkedebruin/airflow,apache/airflow,nathanielvarona/airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,apache/incubator-airflow,bolkedebruin/airflow,lyft/incubator-airflow,danielvdende/incubator-airflow,bolkedebruin/airflow,apache/incubator-airflow,Acehaidrey/incubator-airflow,apache/incubator-airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,mistercrunch/airflow,cfei18/incubator-airflow,apache/airflow,danielvdende/incubator-airflow,lyft/incubator-airflow,lyft/incubator-airflow,apache/airflow,apache/incubator-airflow,mistercrunch/airflow,nathanielvarona/airflow,cfei18/incubator-airflow,bolkedebruin/airflow,danielvdende/incubator-airflow,danielvdende/incubator-airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,apache/airflow,mistercrunch/airflow,apache/airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,nathanielvarona/airflow,mistercrunch/airflow,danielvdende/incubator-airflow,apache/airflow