small fixes

Author: maxbelanger

UPGRADING.md

@@ -4,7 +4,7 @@ This document is designed to show you how to upgrade to the latest version of th
 If you find any issues with either this guide on upgrading or the changes introduced in the new version, please see [CONTRIBUTING.md](CONTRIBUTING.md)
 
 # Upgrading to v12.0.0
-* The SDK no longer provides its own CA bundle to verify SSL connections. It will continue to verify connections through the `requests` library, which makes use of [`certifi`](https://github.com/certifi/python-certifi). You may still provide your own bundle (useful in certain scenarios) through the `ca_certs` parameter of the main classes and of the `create_session` function.
+* The SDK no longer provides its own CA bundle to verify TLS connections. It will continue to verify connections through the `requests` library, which makes use of [`certifi`](https://github.com/certifi/python-certifi). You may still provide your own bundle through the `ca_certs` parameter of the `Dropbox` classes and of the `create_session` function (see the [documentation](https://dropbox-sdk-python.readthedocs.io/en/latest/api/dropbox.html) for details).
 * This will be the last major version to support Python 2.
 
 # Upgrading from v10.X.X to v11.0.0