Update mssqlserver docs to link to EULA description

Author: rnorth

docs/modules/databases/mssqlserver.md

@@ -20,7 +20,9 @@ public class SomeTest {
 ```
 
 !!! warning "EULA Acceptance"
-    Due to licencing restrictions you are required to accept an EULA for this container image. To indicate that you accept the MS SQL Server image EULA, Please place a file at the root of the classpath named `container-license-acceptance.txt`, e.g. at `src/test/resources/container-license-acceptance.txt`. This file should contain the line: `mcr.microsoft.com/mssql/server:latest`
+    Due to licencing restrictions you are required to accept an EULA for this container image. To indicate that you accept the MS SQL Server image EULA, Please place a file at the root of the classpath named `container-license-acceptance.txt`, e.g. at `src/test/resources/container-license-acceptance.txt`. This file should contain the line: `mcr.microsoft.com/mssql/server:2017-CU12` (or, if you are overriding the docker image name/tag, update accordingly).
+    
+    Please see the [`microsoft-mssql-server` image documentation](https://hub.docker.com/_/microsoft-mssql-server#environment-variables) for a link to the EULA document.
 
 ## Adding this module to your project dependencies