[Doc] Update installation doc for Dremio (#9464)

* update installation doc for Dremio

Customers fail to install pyodbc properly which on linux systems requires you to install unixodbc-devel package. Update the instructions to make it clear.

* fix new line
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Naren 2020-04-07 05:01:30 -04:00 committed by GitHub
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@ -377,7 +377,7 @@ Here's a list of some of the recommended packages.
+------------------+---------------------------------------+-------------------------------------------------+
| CockroachDB | ``pip install cockroachdb`` | ``cockroachdb://`` |
+------------------+---------------------------------------+-------------------------------------------------+
| Dremio | ``pip install sqlalchemy_dremio`` | ``dremio://user:pwd@host:31010/`` |
| Dremio | ``pip install sqlalchemy_dremio`` | ``dremio://`` |
+------------------+---------------------------------------+-------------------------------------------------+
| Elasticsearch | ``pip install elasticsearch-dbapi`` | ``elasticsearch+http://`` |
+------------------+---------------------------------------+-------------------------------------------------+
@ -741,6 +741,8 @@ Dremio
Install the following dependencies to connect to Dremio:
* Dremio SQLAlchemy: ``pip install sqlalchemy_dremio``
* If you receive any errors during the installation of ``sqlalchemy_dremio``, make sure to install the prerequisites for PyODBC properly by following the instructions for your OS here: https://github.com/narendrans/sqlalchemy_dremio#installation
* Dremio's ODBC driver: https://www.dremio.com/drivers/
Example SQLAlchemy URI: ``dremio://dremio:dremio123@localhost:31010/dremio``