Release notes for 2.11.2.

Author: rstam

Release Notes/Release Notes v2.11.2.md

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+# .NET Driver Version 2.11.2 Release Notes
+
+This is a patch release that fixes a bug reported since 2.11.1 was released.
+
+An online version of these release notes is available at:
+
+https://github.com/mongodb/mongo-csharp-driver/blob/master/Release%20Notes/Release%20Notes%20v2.11.2.md
+
+The list of JIRA tickets resolved in this release is available at:
+
+https://jira.mongodb.org/issues/?jql=project%20%3D%20CSHARP%20AND%20fixVersion%20%3D%202.11.2%20ORDER%20BY%20key%20ASC
+
+Documentation on the .NET driver can be found at:
+
+http://mongodb.github.io/mongo-csharp-driver/
+
+## Upgrading
+
+Everyone using versions 2.11.0 or 2.11.1 of the C# driver with version 4.4.0 or later of the server should upgrade to 2.11.2.
+The issue fixed is related to simultaneous authentication of two or more connections, in which case a change introduced
+in 2.11.0 can result in authentication failing. Under loads low enough that only one connection is ever opened at the same
+time the issue does not happen.
+
+See: https://jira.mongodb.org/browse/CSHARP-3196
+
+There are no known backwards breaking changes in this release.