[11u] RFR 8235183: Remove the "HACK CODE" in comment

[Reingruber, Richard]

Hi,
 
Original bug:
  https://bugs.openjdk.java.net/browse/JDK-8235183
  https://hg.openjdk.java.net/jdk/jdk/rev/d8b5e32ffa2f
 
Original patch does not apply cleanly to 11u, because
src/java.base/share/classes/sun/security/ssl/NamedGroup.java is missing in
11u.
The NamedGroup.java modified by the original change was added in JDK13 with 
https://bugs.openjdk.java.net/browse/JDK-8171279

Subsequent changes (8226374, 8233954) added the comments to NamedGroup.java that are removed with
the original change.

Changes on other files _did_ apply cleanly.
 
11u webrev:
  http://cr.openjdk.java.net/~rrich/webrevs/8235183.jdk11u/webrev.0/
 
Testing: nightly tests @SAP, i.e. jck and jtreg, also in Xcomp mode with fastdebug and release
builds on all platforms.

Thanks,
Richard.