CI: clarify file patterns in sonar_exclude_list.txt

tools/ci/sonar_exclude_list.txt

@@ -1,10 +1,11 @@
 # exclude list for sonarqube
 # Here're some examples: (relative with the idf_path)
-# - test/**
-# - test/*/*.c
-# - test.c
+# test/**
+# test/*/*.c
+# test.c
+#
 # lines start with # will be ignored
 
 # FreeRTOS upstream code (don't include our port files here)
-- components/freertos/*.c
-- components/freertos/include/freertos/*.h
+components/freertos/*.c
+components/freertos/include/freertos/*.h