Updating release notes for 2.7.0.

Author: rstam

Release Notes/Release Notes v2.7.0.md

@@ -1,22 +1,30 @@
 # .NET Driver Version 2.7.0 Release Notes
 
-## Known Issues:
-* Incomplete SCRAM-SHA-256 Support in .NET Standard: In .NET Standard, authenticating via SCRAM-SHA-256 may not work with non-ASCII passwords because SaslPrep is not fully implemented due to the lack of a string normalization function in .NET Standard 1.6. Normalizing the password into Unicode Normalization Form KC beforehand MAY help. SCRAM-SHA-1 is the recommended alternative for now.
+The main new features of 2.7.0 are support for new features of the 4.0.0 version of the server including:
+
+* Transactions
+* New CountDocuments and EstimatedDocumentCount methods (depending on whether you need an exact result or a fast estimate)
+* Support for change streams on all collections in a cluster or a particular database via the new Watch methods on IMongoClient and IMongoDatabase
+* SCRAM-SHA-256 authentication
 
 An online version of these release notes is available at:
 
 <https://github.com/mongodb/mongo-csharp-driver/blob/master/Release%20Notes/Release%20Notes%20v2.7.0.md>
 
-The full list of JIRA issues that are currently scheduled to be resolved in this release is available at:
+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%202.7.0%20ORDER%20BY%20key%20ASC>
 
-The list may change as we approach the release date.
-
 Documentation on the .NET driver can be found at:
 
 <http://mongodb.github.io/mongo-csharp-driver/>
 
 ## Upgrading
-* The .NET Driver now **disables** certificate revocation checking by default, setting `CheckCertificateRevocation` in `SslSettings` to `false` by default. Any applications relying on the older default of `true` now must explicitly set `CheckCertificateRevocation` to `true` in in `SslSettings` to re-enable certificate revocation checking.
- * Previously, the driver enabled certificate revocation checking by default, in contrast to the `mongo` shell and other MongoDB drivers. This was also in contrast to .NET's defaults for `SslStream` (see .NET Framework documentation [here](https://docs.microsoft.com/en-us/dotnet/api/system.net.security.sslstream.authenticateasclient?view=netframework-4.7.2#System_Net_Security_SslStream_AuthenticateAsClient_System_String_) and .NET Standard documentation [here](https://docs.microsoft.com/en-us/dotnet/api/system.net.security.sslstream.authenticateasclient?view=netstandard-2.0#System_Net_Security_SslStream_AuthenticateAsClient_System_String_)).
+
+* The .NET Driver now **disables** certificate revocation checking by default, setting `CheckCertificateRevocation` in `SslSettings` to `false` by default. Any applications relying on the older default of `true` now must explicitly set `CheckCertificateRevocation` to `true` in `SslSettings` to re-enable certificate revocation checking.
+
+  Previously, the driver enabled certificate revocation checking by default, in contrast to the `mongo` shell and other MongoDB drivers. This was also in contrast to .NET's defaults for `SslStream` (see .NET Framework documentation [here](https://docs.microsoft.com/en-us/dotnet/api/system.net.security.sslstream.authenticateasclient?view=netframework-4.7.2#System_Net_Security_SslStream_AuthenticateAsClient_System_String_) and .NET Standard documentation [here](https://docs.microsoft.com/en-us/dotnet/api/system.net.security.sslstream.authenticateasclient?view=netstandard-2.0#System_Net_Security_SslStream_AuthenticateAsClient_System_String_)).
+
+## Known Issues:
+
+* Incomplete SCRAM-SHA-256 Support in .NET Standard: In .NET Standard, authenticating via SCRAM-SHA-256 may not work with non-ASCII passwords because SaslPrep is not fully implemented due to the lack of a string normalization function in .NET Standard 1.5. Normalizing the password into Unicode Normalization Form KC beforehand MAY help. SCRAM-SHA-1 is the recommended alternative (when targeting .NET Standard) for now.