[jdk11u-dev] RFR: 8277815: Fix mistakes in legal header backports

[Christoph Langer]

This corrects the copyright header issues, introduced by the backports of JDK-8213263 and JDK-8213328.

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Commit messages:
 - JDK-8277815

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/663/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=663&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277815
  Stats: 6 lines in 2 files changed: 4 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/663.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/663/head:pull/663

PR: https://git.openjdk.java.net/jdk11u-dev/pull/663