Change state_type to event_type
I couldn't find any other reference to a state_type within the entire specification. I assume this is supposed to be the event_type? This aligns with the description of changes resulting from a state update.
@@ -94,7 +94,7 @@ results of the resolution so far.
passes authentication in :math:`R` and add it to :math:`R`.
A *conflict* occurs between states where those states have different
-``event_ids`` for the same ``(state_type, state_key)``. The events thus
+``event_ids`` for the same ``(event_type, state_key)``. The events thus
affected are said to be *conflicting* events.
