Add more to the terminal events

Signed-off-by: Daniel Han <[email protected]>

testing-events.md

@@ -24,7 +24,7 @@ The predicates for `testCaseRun` must follow the following expectations:
 - The following events must be preceded by some other event: `finished` and `cancelled`.
 - A `queued` event must be followed by one of the following: `started`, `finished`, or `cancelled`.
 - A `started` event must be followed by a `finished` event.
-- A `skipped` event will *not* be followed by any other events.
+- The following events are terminal events, and will *not* be followed by other events: `finished` and `skipped`. 
 
 | Subject                         | Description                                  | Predicates                                                                                                 |
 |---------------------------------|----------------------------------------------|------------------------------------------------------------------------------------------------------------|