Subparagraph 8: I suggest to replace "BEFORE row-level triggers to execute" with "row-level BEFORE triggers to execute" for consistency.
Subparagraph 14: While WHEN can be used with INSERT too, I suggest to replace "However, in an AFTER trigger, the WHEN condition is evaluated just after the row update occurs, and it determines whether an event is queued to fire the trigger at the end of statement." with "However, in an AFTER trigger, the WHEN condition is evaluated just after the row inserted or updated, and it determines whether an event is queued to fire the trigger at the end of statement." -- // Dmitry.