Account for non-preemption and interrupt level not supported on SMP

Closes #3000.

c-user/directive_status_codes.rst

@@ -74,7 +74,7 @@ The directives are:
  * - ``RTEMS_NOT_OWNER_OF_RESOURCE``
    - not owner of resource
  * - ``RTEMS_NOT_IMPLEMENTED``
-   - directive not implemented
+   - directive not implemented or feature not available in configuration
  * - ``RTEMS_INTERNAL_ERROR``
    - RTEMS inconsistency detected
  * - ``RTEMS_NO_MEMORY``

c-user/task_manager.rst

@@ -636,6 +636,10 @@ DIRECTIVE STATUS CODES:
         - too many tasks created
       * - ``RTEMS_UNSATISFIED``
         - not enough memory for stack/FP context
+      * - ``RTEMS_UNSATISFIED``
+        - non-preemption mode not supported on SMP system
+      * - ``RTEMS_UNSATISFIED``
+        - interrupt level mode not supported on SMP system
       * - ``RTEMS_TOO_MANY``
         - too many global objects
 
@@ -1279,6 +1283,10 @@ DIRECTIVE STATUS CODES:
         - task mode set successfully
       * - ``RTEMS_INVALID_ADDRESS``
         - ``previous_mode_set`` is NULL
+        - not enough memory for stack/FP context
+      * - ``RTEMS_NOT_IMPLEMENTED``
+        - non-preemption mode not supported on SMP system
+      * - ``RTEMS_NOT_IMPLEMENTED``
 
 DESCRIPTION:
     This directive manipulates the execution mode of the calling task.  A