git: openjdk/jdk21: 8310676: add note about unnamed module to Elements.getAllModuleElements

[Joe Darcy]

Changeset: 7489967d
Author:    Joe Darcy <darcy at openjdk.org>
Date:      2023-06-23 23:05:10 +0000
URL:       https://git.openjdk.org/jdk21/commit/7489967d6a88458cef4a7887ba2d6a881b4eab4f

8310676: add note about unnamed module to Elements.getAllModuleElements

Reviewed-by: jjg
Backport-of: 69f3114c4119d66a8c16cf95c35ea1adc488bdee

! src/java.compiler/share/classes/javax/lang/model/util/Elements.java