docs(airflow) add back auth token info for airflow (#5960)

Seems this PR #5703 was accidentally reverted.

Author: hsheth2

docs/lineage/airflow.md

@@ -33,7 +33,7 @@ We recommend you use the lineage plugin if you are on Airflow version >= 2.0.2 o
 
    ```shell
    # For REST-based:
-   airflow connections add  --conn-type 'datahub_rest' 'datahub_rest_default' --conn-host 'http://datahub-gms:8080'
+   airflow connections add  --conn-type 'datahub_rest' 'datahub_rest_default' --conn-host 'http://datahub-gms:8080' --conn-password '<optional datahub auth token>'
    # For Kafka-based (standard Kafka sink config can be passed via extras):
    airflow connections add  --conn-type 'datahub_kafka' 'datahub_kafka_default' --conn-host 'broker:9092' --conn-extra '{}'
    ```
@@ -88,7 +88,7 @@ If you are looking to run Airflow and DataHub using docker locally, follow the g
 
    ```shell
    # For REST-based:
-   airflow connections add  --conn-type 'datahub_rest' 'datahub_rest_default' --conn-host 'http://localhost:8080'
+   airflow connections add  --conn-type 'datahub_rest' 'datahub_rest_default' --conn-host 'http://datahub-gms:8080' --conn-password '<optional datahub auth token>'
    # For Kafka-based (standard Kafka sink config can be passed via extras):
    airflow connections add  --conn-type 'datahub_kafka' 'datahub_kafka_default' --conn-host 'broker:9092' --conn-extra '{}'
    ```