hg: jdk/jdk15: 8247785: Small clarification of the javadoc about builtin class loaders

[mandy.chung at oracle.com]

Changeset: 497e41258eb7
Author:    mchung
Date:      2020-06-24 12:21 -0700
URL:       https://hg.openjdk.java.net/jdk/jdk15/rev/497e41258eb7

8247785: Small clarification of the javadoc about builtin class loaders
Reviewed-by: alanb, rriggs, dholmes

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