Integrated: 8263040: fix for JDK-8262122 fails validate-source

[Daniel D.Daugherty]

A trivial fix for a bad copyright line in test/hotspot/jtreg/gc/shenandoah/TestReferenceRefersToShenandoah.java

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Commit messages:
 - 8263040: fix for JDK-8262122 fails validate-source

Changes: https://git.openjdk.java.net/jdk/pull/2831/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2831&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263040
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2831.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2831/head:pull/2831

PR: https://git.openjdk.java.net/jdk/pull/2831