tests: fatal: group fatal tests

Group test using doxygen.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

Author: nashif

tests/kernel/fatal/exception/src/main.c

@@ -300,7 +300,7 @@ void check_stack_overflow(k_thread_entry_t handler, uint32_t flags)
  * should match. Check for stack sentinel feature by overflowing the
  * thread's stack and check for the exception.
  *
- * @ingroup kernel_common_tests
+ * @ingroup kernel_fatal_tests
  */
 ZTEST(fatal_exception, test_fatal)
 {

tests/kernel/fatal/no-multithreading/src/main.c

@@ -117,14 +117,14 @@ static const exc_trigger_func_t exc_trigger_func[] = {
 };
 
 /**
- * @brief Test the kernel fatal error handling works correctly
+ * @brief Verify the kernel fatal error handling works correctly
  * @details Manually trigger the crash with various ways and check
  * that the kernel is handling that properly or not. Also the crash reason
  * should match.
  *
- * @ingroup kernel_common_tests
+ * @ingroup kernel_fatal_tests
  */
-ZTEST(fatal_no_mt, test_fatal)
+ZTEST(fatal_no_mt, test_fatal_no_mt)
 {
 #ifdef VIA_TWISTER
 #define EXC_TRIGGER_FUNC_IDX VIA_TWISTER