git: openjdk/loom: fibers: Expand ShutdownOnSuccess/ShutdownOnFailure tests, more javadoc tweaks

[duke]

Changeset: a128c5c1
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2023-04-26 18:11:08 +0000
URL:       https://git.openjdk.org/loom/commit/a128c5c15d068a064063a66048e1312242674e7a

Expand ShutdownOnSuccess/ShutdownOnFailure tests, more javadoc tweaks

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