fixup: chilldkg: add API docs for blaming functions

python/chilldkg_ref/chilldkg.py

@@ -597,7 +597,7 @@ def participant_investigate(
 
     This function can optionally be called when `participant_step2` raises
     `UnknownFaultyParticipantOrCoordinatorError`. It narrows down the suspected
-    faulty parties by analyzing the blame message provided by the coordinator.
+    faulty parties by analyzing the investigation message provided by the coordinator.
 
     This function does not return normally. Instead, it raises one of two
     exceptions.
@@ -606,7 +606,7 @@ def participant_investigate(
         error: `UnknownFaultyParticipantOrCoordinatorError` raised by
             `participant_step2`.
         cinv: Coordinator investigation message for this participant as output
-            by `coordinator_blame`.
+            by `coordinator_investigate`.
 
     Raises:
         FaultyParticipantOrCoordinatorError: If another known participant or the
@@ -736,7 +736,7 @@ def coordinator_investigate(
         pmsgs: List of first messages received from the participants.
 
     Returns:
-        List[CoordinatorInvestigationMsg]: A list of blame messages, each
+        List[CoordinatorInvestigationMsg]: A list of investigation messages, each
             intended for a single participant.
     """
     enc_cinvs = encpedpop.coordinator_investigate([pmsg.enc_pmsg for pmsg in pmsgs])