CSHARP-3129: Add release notes for 2.11.0-beta2

Author: vincentkam

Release Notes/Release Notes v2.11.0-beta2.md

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+# .NET Driver Version 2.11.0-beta2 Release Notes
+
+This is a beta release for the 2.11.0 version of the driver.
+
+The main new features in 2.11.0-beta2 support new features in MongoDB 4.4.0. These features include:
+
+* Support for all new
+  [``$meta``](https://docs.mongodb.com/manual/reference/operator/projection/meta/)
+  projections: `randVal`, `searchScore`, `searchHighlights`,
+  `geoNearDistance`, `geoNearPoint`, `recordId`, `indexKey` and
+  `sortKey`
+* Support for passing a hint to update commands as well as
+  `findAndModify` update and replace operations
+* Support for `allowDiskUse` on find operations
+* Support for `MONGODB-AWS` authentication using Amazon Web Services
+  (AWS) Identity and Access Management (IAM) credentials
+* Support for stapled OCSP (Online Certificate Status Protocol) (macOS only)
+* Support for shorter SCRAM (Salted Challenge Response Authentication Mechanism) conversations
+* Support for speculative SCRAM and MONGODB-X509 authentication
+* Support for the `CommitQuorum` option in `createIndexes`
+* Support for [hedged reads](https://docs.mongodb.com/master/core/read-preference-hedge-option/index.html)
+
+Other new additions and updates in this beta include:
+
+* A new target of .NET Standard 2.0
+* Support for Snappy compression on .NET Core on Windows (in addition
+  to existing support on .NET Framework)
+* Support for Zstandard compression on Windows on 64-bit platforms
+* A new default of enabling certificate revocation checking.
+* A new URI option `tlsDisableCertificateRevocationCheck` to disable
+  certificate revocation checking.
+* An expanded list of retryable write errors via the inclusion of
+  `ExceededTimeLimit`, `LockTimeout` and `ClientDisconnect`
+* A new GuidRepresentationMode setting to opt-in to the new V3 GuidRepresentation mode
+* Improved SDAM (Server Discovery and Monitoring) error handling
+* Support for the `AuthorizedDatabases` option in `ListDatabases`
+* Session support for `AsQueryable`
+
+An online version of these release notes is available at:
+
+https://github.com/mongodb/mongo-csharp-driver/blob/master/Release%20Notes/Release%20Notes%20v2.11.0-beta2.md
+
+The full list of JIRA issues that are currently scheduled to be resolved in this release is available at:
+
+https://jira.mongodb.org/issues/?jql=project%20%3D%20CSHARP%20AND%20fixVersion%20%3D%202.11.0%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
+
+### Backwards compatibility with driver version 2.7.0–2.10.x
+Because certificate revocation checking is now enabled by default, an
+application that is unable to contact the OCSP endpoints and/or CRL
+distribution points specified in a server's certificate may experience
+connectivity issues (e.g. if the application is behind a firewall with
+an outbound whitelist). This is because the driver needs to contact
+the OCSP endpoints and/or CRL distribution points specified in the
+server’s certificate and if these OCSP endpoints and/or CRL
+distribution points are not accessible, then the connection to the
+server may fail. In such a scenario, connectivity may be able to be
+restored by disabling certificate revocation checking by adding
+`tlsDisableCertificateRevocationCheck=true` to the application's connection
+string.