message: docs: fix bad extras_require reference
diff: @@ -402,7 +402,8 @@ Here's a list of some of the recommended packages.
  | | sqlalchemy-vertica-python`` | |
  +------------------+---------------------------------------+-------------------------------------------------+
  | Hana | ``pip install hdbcli sqlalchemy-hana``| ``hana://`` |
  -| | or ``pip install superset[hana]`` | |
  +| | or | |
  +| | ``pip install apache-superset[hana]`` | |
  +------------------+---------------------------------------+-------------------------------------------------+
  