Adding a clarification about Lazy Index Mode (#12972)

* Adding a clarification about Lazy Index Mode

In June 2020, we introduced a change that no longer allows new containers to be set to Lazy indexing mode. If your Azure Cosmos DB account already contains at least one container with lazy indexing, this account is automatically exempt from the change.

https://docs.microsoft.com/en-us/azure/cosmos-db/index-policy

* Update README.md

Adding clarification about other APIs.

* Clarification on Lazy index mode.

Clarification on Lazy index mode.

* Update documents.py

* Update documents.py

* Update documents.py

* Update README.md

sdk/cosmos/README.md

@@ -1,10 +1,8 @@
 # Azure Cosmos DB SQL API client SDKs for Python
 
-Azure Cosmos DB is a globally distributed, multi-model database service that supports document, key-value, wide-column, and graph databases.
+Azure Cosmos DB is a globally distributed, multi-model database service that supports document, key-value, wide-column, and graph databases. For more information, go to [https://www.gotcosmos.com/](https://www.gotcosmos.com/) .
 
-For more information, go to [https://www.gotcosmos.com/](https://www.gotcosmos.com/) .
-
-Use the Azure Cosmos DB SQL API SDKs for application development and database management.
+Use the Azure Cosmos DB SQL API SDKs for application development and database management. For all other APIs, please check the [documentation](https://docs.microsoft.com/en-us/azure/cosmos-db/introduction) to evaluate the best SDK for your project.
 
 ## Contents of this folder
 

sdk/cosmos/azure-cosmos/README.md

@@ -313,6 +313,7 @@ The container name must be unique within the database.""")
 
 ```
 ### Logging
+
 This library uses the standard
 [logging](https://docs.python.org/3.5/library/logging.html) library for logging.
 Basic information about HTTP sessions (URLs, headers, etc.) is logged at INFO
@@ -382,7 +383,7 @@ For more extensive documentation on the Cosmos DB service, see the [Azure Cosmos
 [venv]: https://docs.python.org/3/library/venv.html
 [virtualenv]: https://virtualenv.pypa.io
 
-# Contributing
+## Contributing
 
 This project welcomes contributions and suggestions.  Most contributions require you to agree to a
 Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us

sdk/cosmos/azure-cosmos/azure/cosmos/documents.py

@@ -130,7 +130,7 @@ class IndexingMode(object):
         The index is always kept up to date with the data.
     :ivar str Lazy:
         Index is updated asynchronously with respect to a create or update
-        operation.
+        operation. Not supported for new containers since June/2020.
 
         With lazy indexing, queries are eventually consistent. The index is
         updated when the collection is idle.