hg: jdk/submit: 8221267: Document the jdk.net.URLClassPath.showIgnoredClassPathEntries system property

[brent.christian at oracle.com]

Changeset: a38438fcbbd2
Author:    bchristi
Date:      2019-05-01 13:07 -0700
URL:       http://hg.openjdk.java.net/jdk/submit/rev/a38438fcbbd2

8221267: Document the jdk.net.URLClassPath.showIgnoredClassPathEntries system property
Reviewed-by: alanb, bpb, lancea

! src/java.base/share/classes/java/lang/ClassLoader.java