MXS-2090 Update 2.3.1 release notes

Documentation/Release-Notes/MaxScale-2.3.1-Release-Notes.md

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+# MariaDB MaxScale 2.3.1 Release Notes
+
+Release 2.3.1 is a Beta release.
+
+This document describes the changes in release 2.3.1, when compared to
+release 2.3.0.
+
+For any problems you encounter, please consider submitting a bug
+report at [Jira](https://jira.mariadb.org).
+
+## Changed Features
+
+### Binlog Router
+
+Secondary masters can now be specified also when file + position
+based replication is used. Earlier it was possible only in conjunction
+with GTID based replication.
+
+## Bug fixes
+
+[Here is a list of bugs fixed in MaxScale 2.3.1.](https://jira.mariadb.org/issues/?jql=project%20%3D%20MXS%20AND%20issuetype%20%3D%20Bug%20AND%20status%20%3D%20Closed%20AND%20fixVersion%20%3D%202.3.1)
+
+## Known Issues and Limitations
+
+There are some limitations and known issues within this version of MaxScale.
+For more information, please refer to the [Limitations](../About/Limitations.md) document.
+
+## Packaging
+
+RPM and Debian packages are provided for the Linux distributions supported
+by MariaDB Enterprise.
+
+Packages can be downloaded [here](https://mariadb.com/resources/downloads).
+
+## Source Code
+
+The source code of MaxScale is tagged at GitHub with a tag, which is identical
+with the version of MaxScale. For instance, the tag of version X.Y.Z of MaxScale
+is X.Y.Z. Further, *master* always refers to the latest released non-beta version.
+
+The source code is available [here](https://github.com/mariadb-corporation/MaxScale).