Fix size of task task notification entry in TCB (#82)

This was reported here -
https://forums.freertos.org/t/about-task-notifications/19190

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>

Author: aggarg

ch10.md

@@ -81,9 +81,9 @@ group to perform an equivalent operation. This is because each
 communication object (queue, semaphore or event group) must be created
 before it can be used, whereas enabling task notification functionality
 has a fixed overhead.  The RAM cost for task notifications is
-`configTASK_NOTIFICATION_ARRAY_ENTRIES` * 8 bytes per task.  The
+`configTASK_NOTIFICATION_ARRAY_ENTRIES` * 5 bytes per task.  The
 default value for `configTASK_NOTIFICATION_ARRAY_ENTRIES` is 1 making
-the default size for task notifications is 8 bytes per task.
+the default size for task notifications is 5 bytes per task.
 
 ### 10.2.3 Limitations of Task Notifications