Fix a typo in 4.0.3 release notes

Author: michaelklishin

release-notes/4.0.3.md

@@ -86,7 +86,7 @@ Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://
 
  * Initial support for Erlang/OTP 27, starting with [`27.1.2`](https://github.com/erlang/otp/releases/tag/OTP-27.1.2).
 
-   Releases prior to `2.7.1.2` are affected
+   Releases prior to `27.1.2` are affected
    by several bugs that can seriously affect RabbitMQ users, in particular those using TLS for client connections.
 
    RPM and Debian packages will reflect Erlang 27 support in their metadata starting with a later patch release, `4.0.4`.