Release documentation minor update

Author: TaddyHC

content/hardware/04.pro/boards/portenta-x8/tutorials/14.x8-firmware-release-notes/x8-firmware-release-notes.md

@@ -29,7 +29,9 @@ Compatible carriers with the supported device:
 
 The following section highlights the critical updates and enhancements introduced in the latest firmware version. It presents the most significant progress and optimizations implemented to improve performance, enhance user experience, and strengthen security.
 
-## Latest Firmware Version: __861 (Release arduino-91.2) - June 26, 2024__
+## Latest Firmware Version: __861 (Release arduino-91.2)__
+
+**Release Date: June 26, 2024**
 
 The listing herein offers a glimpse into the Portenta X8 firmware's continuous improvement and enhancement. You can expect a concise overview of the integrated key new features, major bug fixes, and critical security patches to ensure the highest level of functionality and performance within the Portenta X8 system.