doc: release-notes-4.3: Mention the new size field in video format

Mention the new size field in video format structure

Signed-off-by: Hugues Fruchet <[email protected]>

Author: hfruchet-st

doc/releases/release-notes-4.3.rst

@@ -270,6 +270,10 @@ New APIs and options
 
   * :kconfig:option:`CONFIG_TASK_WDT_DUMMY`
 
+* Video
+
+  * :c:member:`video_format.size` field
+
 .. zephyr-keep-sorted-stop
 
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