git: openjdk/loom: fibers: javadoc updates

[duke]

Changeset: 9d7fe0dc
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2023-04-28 16:55:02 +0000
URL:       https://git.openjdk.org/loom/commit/9d7fe0dcc607ee018a50ec26bc67063853697bdd

javadoc updates

! src/java.base/share/classes/java/util/concurrent/StructuredTaskScope.java
! test/jdk/java/util/concurrent/StructuredTaskScope/StructuredTaskScopeTest.java