Update link in latest release notes

Fixed a link in the release note section to ensure proper navigation.

Author: psonnera

docs/EN/index.md

@@ -5,7 +5,7 @@
 ```{admonition} Latest Release
 :class: note
 
- 31 March 2026 : Version 3.4.2.1 is out. Check the [Release Notes](#latestrelease) to see what's new and follow the instructions in the [update manual](UpdateToNewVersion) to update to a the version.
+ 31 March 2026 : Version 3.4.2.1 is out. Check the [Release Notes](#latestrelease) to see what's new and follow the instructions in the [update manual](#UpdateToNewVersion) to update to a the version.
 
 ```