More clarity.

Note this is counter what the MSC actually proposed to add, but
I think it's clear that this is what it meant.

data/api/client-server/relations.yaml

@@ -304,7 +304,7 @@ components:
       required: false
       description: |-
         Whether to additionally include events which only relate indirectly to the
-        given event, i.e. events related to the root events via one or more direct relationships.
+        given event, i.e. events related to the given event via two or more direct relationships.
 
         If set to `false`, only events which have direct a relation with the given
         event will be included.