modify additional comment about bookending

db-tests/src/test/java/gov/nasa/jpl/aerie/database/ExternalEventTests.java

@@ -972,8 +972,8 @@ void rule1_solitary() throws SQLException {
       }
 
       /**
-       * This test more thoroughly examines the lack of supercession with other sources. The event is bookended, but
-       *    none of the surrounding sources and their events can/should overwrite it.
+       * An event that is in a partially overlapped source but outside of the overlap is not superseded, even if
+       *    the other source "bookends" it (i.e. the end of that source meets the event's start time).
        *
        *    A:     +++++aa++++++
        *    B:  bb+++