message: docs: correct location of existing time grain definition
diff: @@ -658,13 +658,13 @@ CSV_EXPORT = {"encoding": "utf-8"}
  # Time grain configurations
  # ---------------------------------------------------
  # List of time grains to disable in the application (see list of builtin
  -# time grains in superset/db_engine_specs.builtin_time_grains).
  +# time grains in superset/db_engine_specs/base.py).
  # For example: to disable 1 second time grain:
  # TIME_GRAIN_DENYLIST = ['PT1S']
  TIME_GRAIN_DENYLIST: List[str] = []
  # Additional time grains to be supported using similar definitions as in
  -# superset/db_engine_specs.builtin_time_grains.
  +# superset/db_engine_specs/base.py.
  # For example: To add a new 2 second time grain:
  # TIME_GRAIN_ADDONS = {'PT2S': '2 second'}
  TIME_GRAIN_ADDONS: Dict[str, str] = {}
  