Trivial javadoc change to add a reference to JVMS 4.1 in `Lookup::defineHiddenClass` such that the reference like `this_class` would be referred to JVMS for details.
------------- Commit messages: - 8267995: Add reference to JVMS class file format in Lookup::defineHiddenClass Changes: https://git.openjdk.java.net/jdk/pull/4340/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4340&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8267995 Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod Patch: https://git.openjdk.java.net/jdk/pull/4340.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/4340/head:pull/4340 PR: https://git.openjdk.java.net/jdk/pull/4340
