hg: jdk/jdk: 8209607: Remove stale comment for JNI mutexes

[kim.barrett at oracle.com]

Changeset: 211998500d39
Author:    kbarrett
Date:      2018-08-16 19:49 -0400
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/211998500d39

8209607: Remove stale comment for JNI mutexes
Summary: Remove comment.
Reviewed-by: dholmes

! src/hotspot/share/runtime/mutexLocker.cpp