Update 5.12.4.md

release-notes/5.12.4.md

@@ -23,7 +23,7 @@ Released April 25, 2019
 
 - **CiviMail - Fix "Preview" action when using `viewUrl` tokens and mailing hashes. ([dev/core#891](https://lab.civicrm.org/dev/core/issues/891): [14124](https://github.com/civicrm/civicrm-core/pull/14124))**
 
-- **Installer - Fix diagnostic for MySQL `utf8mb4`. ([dev/core#880](https://lab.civicrm.org/dev/core/issues/880): [14129](https://github.com/civicrm/civicrm-core/pull/14129))**
+- **Installer - Fix diagnostic for MySQL `utf8mb4` support. ([dev/core#880](https://lab.civicrm.org/dev/core/issues/880): [14129](https://github.com/civicrm/civicrm-core/pull/14129))**
 
 ## <a name="credits"></a>Credits