Add notebook installation instructions (#334)

Add notebook installation instructions

---------

Signed-off-by: Serge Smertin <259697+nfx@users.noreply.github.com>
Signed-off-by: Pieter Noordhuis <pcnoordhuis@gmail.com>
Co-authored-by: Pieter Noordhuis <pieter.noordhuis@databricks.com>

docs/index.rst

@@ -10,6 +10,13 @@ performing intelligent retries. Install it via
 
   $ pip install databricks-sdk
 
+To install the Databricks SDK for Python from a Databricks Notebook as a `notebook-scoped library <https://docs.databricks.com/en/libraries/notebooks-python-libraries.html>`_, please run:
+
+.. code-block::
+
+  %pip install databricks-sdk
+  dbutils.library.restartPython()
+
 This SDK is supported for production use cases, but we do expect future releases to have `some interface changes <https://github.com/databricks/databricks-sdk-py#interface-stability>`_.
 We are keen to hear feedback from you on these SDKs. Please `file GitHub issues <https://github.com/databricks/databricks-sdk-py/issues>`_, and we will address them.