Use a standard header in 4.1.6 release notes

(cherry picked from commit 520119f)

Conflicts:
    release-notes/4.1.6.md

Author: michaelklishin

release-notes/4.1.6.md

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+## 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
+
+* Enabling the `khepri_db` feature flag while the [Log Exchange](https://www.rabbitmq.com/docs/logging#log-exchange)
+  was enabled could cause a RabbitMQ node to run out of memory and crash.
+
+  GitHub issues: [#14069](https://github.com/rabbitmq/rabbitmq-server/discussions/14069), [#14796](https://github.com/rabbitmq/rabbitmq-server/pull/14796)