git: openjdk/jdk: master: 8340307: Add explanation around MemorySegment:reinterpret regarding arenas

[Per Minborg]

Changeset: 646d64e8
Branch: master
Author:    Per Minborg <pminborg at openjdk.org>
Date:      2024-11-04 14:12:30 +0000
URL:       https://git.openjdk.org/jdk/commit/646d64e88003ef2a2e1960cef0cc59d1a97bb912

8340307: Add explanation around MemorySegment:reinterpret regarding arenas

Reviewed-by: jvernee

! src/java.base/share/classes/java/lang/foreign/MemorySegment.java
! test/jdk/java/foreign/TestSegments.java