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

[Albert Mingkun Yang]

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

> Simple change of adding some documentation.

Thanks for the review.

-------------

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