doc: release: 3.3: Add note on MCUmgr handler update
Adds a note on MCUmgr handlers now being automatically called
without needing an application to manually register them.
@@ -52,6 +52,12 @@ Changes in this release
but will cause issues and failures in client software with future updates
to Zephyr/MCUmgr such as image verification.
+* MCUmgr handlers no longer need to be registered by the application code,
+ handlers just need to use a define which will then call the supplied
+ registration function at boot-up. If applications register this then
+ those registrations should be removed to prevent registering the same
+ handler multiple times.
+
Removed APIs in this release
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