Add commented-out metaspace entries

This change adds commented-out metaspace entries to the JRE
configurations.  This is being done to help point users upgrading to
Java 1.8 to the documentation about the changes between 1.7 and 1.8.

[#71298674]
Merge 71298674-metaspace to master

[Completes #71298674]
Merge remote-tracking branch 'upstream/master'