hg: jdk/sandbox: Improve comments

[thomas.stuefe at gmail.com]

Changeset: ba3def64a672
Author:    stuefe
Date:      2020-05-02 14:58 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/ba3def64a672

Improve comments

! src/hotspot/share/memory/metaspace/allocationGuard.hpp
! src/hotspot/share/memory/metaspace/binlist.hpp
! src/hotspot/share/memory/metaspace/blocktree.hpp
! src/hotspot/share/memory/metaspace/chunkAllocSequence.hpp
! src/hotspot/share/memory/metaspace/chunkHeaderPool.hpp
! src/hotspot/share/memory/metaspace/chunkLevel.hpp
! src/hotspot/share/memory/metaspace/chunkManager.hpp
! src/hotspot/share/memory/metaspace/commitMask.hpp
! src/hotspot/share/memory/metaspace/freeBlocks.hpp