RFR: 8272975: ParallelGC: add documentation to heap memory layout

[Thomas Schatzl]

On Wed, 25 Aug 2021 10:03:02 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple change of adding some documentation.

Lgtm (and trivial if it matters, but please let somebody else have a look at it too).

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Marked as reviewed by tschatzl (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/5247