RFR: 8313949: Missing word in GPLv2 license text in StackMapTableAttribute.java

[Dmitry Cherepanov]

The PR suggests updating copyright headers in two files so that they are the same as in other files.

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Commit messages:
 - update copyright headers

Changes: https://git.openjdk.org/jdk/pull/15269/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15269&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313949
  Stats: 6 lines in 2 files changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/15269.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15269/head:pull/15269

PR: https://git.openjdk.org/jdk/pull/15269