message: Add Snowflake connection string instructions
diff: @@ -370,6 +370,24 @@ You can also use `PyAthena` library
  _(See more details at https://github.com/laughingman7743/PyAthena#sqlalchemy.)_
  +Snowflake
  +---------
  +
  +The connection string for Snowflake looks like this ::
  +
  + snowflake://{user}:{password}@{account}.{region}/{database}?role={role}&warehouse={warehouse}
  +
  +The schema is not necessary in the connection string, as it is defined per table/query.
  +The role and warehouse can be omitted if defaults are defined for the user, i.e.
  +
  + snowflake://{user}:{password}@{account}.{region}/{database}
  +
  +Make sure the user has privileges to access and use all required
  +databases/schemas/tables/views/warehouses, as the Snowflake SQLAlchemy engine does
  +not test for user rights during engine creation.
  +
  +_(See more details at https://github.com/snowflakedb/snowflake-sqlalchemy.)_
  +
  Caching
  -------
  