git: openjdk/jdk21: 8309957: Rename JDK-8309595 test to conform

[Jim Laskey]

Changeset: 7ca0f146
Author:    Jim Laskey <jlaskey at openjdk.org>
Date:      2023-06-20 12:02:35 +0000
URL:       https://git.openjdk.org/jdk21/commit/7ca0f1460ce843c2ceb9317d742bec65e94714a4

8309957: Rename JDK-8309595 test to conform

Reviewed-by: prappo
Backport-of: 1d1ed0d8f7af28ce2a394f020f1732c2d9f9daac

= test/langtools/jdk/javadoc/doclet/testUnnamed/TestUnnamed.java