Use a standard header in 4.1.6 release notes

Author: michaelklishin

release-notes/4.1.6.md

@@ -1,5 +1,24 @@
 ## RabbitMQ 4.1.6
 
+RabbitMQ `4.1.6` is a maintenance release in the `4.1.x` [release series](https://www.rabbitmq.com/release-information).
+
+It is **strongly recommended** that you read [4.1.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.1.0)
+in detail if upgrading from a version prior to `4.1.0`.
+
+
+### Minimum Supported Erlang Version
+
+[RabbitMQ and Erlang/OTP Compatibility Matrix](https://www.rabbitmq.com/docs/which-erlang) has more details on Erlang version requirements for RabbitMQ.
+
+Nodes **will fail to start** on older Erlang releases.
+
+
+## Changes Worth Mentioning
+
+Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://github.com/rabbitmq/rabbitmq-server/tree/v4.1.x/release-notes).
+
+
+
 ### Core Server
 
 #### Bug Fixes