server-server api: Fix swapped pdu state update field descriptions
@@ -444,9 +444,9 @@ keys exist to support this:
state is updated
``required_power_level`` Integer The required power level needed to
replace this update.
-``prev_state_id`` String The homeserver of the update this
- replaces
-``prev_state_origin`` String The PDU id of the update this replaces.
+``prev_state_id`` String The PDU id of the update this replaces.
+``prev_state_origin`` String The homeserver of the update this
+ replaces.
``user_id`` String The user updating the state.
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