Extra links supported for operators coming from third-party packages:

airflow.serialization.serialized_objects.BUILTIN_OPERATOR_EXTRA_LINKS

tests/core/test_providers_manager.py
'apache-airflow-providers-google',
    'apache-airflow-providers-grpc',
    'apache-airflow-providers-hashicorp',
    'apache-airflow-providers-http',
    'apache-airflow-providers-imap',
    'apache-airflow-providers-jdbc',
    'apache-airflow-providers-jenkins',
    'apache-airflow-providers-jira',
    'apache-airflow-providers-microsoft-azure',
    'apache-airflow-providers-microsoft-mssql',
    'apache-airflow-providers-microsoft-winrm',
    'apache-airflow-providers-mongo',
    'apache-airflow-providers-mysql',
    'apache-airflow-providers-odbc',
    'apache-airflow-providers-openfaas',
    'apache-airflow-providers-opsgenie',
    'apache-airflow-providers-oracle',
    'apache-airflow-providers-pagerduty',
    'apache-airflow-providers-papermill',
    'apache-airflow-providers-plexus',
    'apache-airflow-providers-postgres',
    'apache-airflow-providers-presto',
    'apache-airflow-providers-qubole',
    'apache-airflow-providers-redis',
    'apache-airflow-providers-salesforce',
    'apache-airflow-providers-samba',
    'apache-airflow-providers-segment',
    'apache-airflow-providers-sendgrid',
    'apache-airflow-providers-sftp',
    'apache-airflow-providers-singularity',