doc: release: 2.4: Add note related to storage

Add flash SHA-256 integrity check note related to storage subsys.

Signed-off-by: Gerson Fernando Budke <[email protected]>

Author: nandojve

doc/releases/release-notes-2.4.rst

@@ -744,6 +744,9 @@ Libraries / Subsystems
     the command cannot be processed.
 
 
+* Storage:
+  * Added flash SHA-256 integrity check.
+
 * Tracing:
   * Tracing backed API now checks if init function exists prio to calling it.