[jdk18u] RFR: 8282583: Update BCEL md to include the copyright notice

[Ravi Reddy]

Clean backport of https://github.com/openjdk/jdk/commit/8478173d837113bf603aadb614badd461f474250 to jdk18u

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Commit messages:
 - 8282583: Update BCEL md to include the copyright notice

Changes: https://git.openjdk.java.net/jdk18u/pull/47/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk18u&pr=47&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282583
  Stats: 8 lines in 1 file changed: 0 ins; 3 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk18u/pull/47.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk18u pull/47/head:pull/47

PR: https://git.openjdk.java.net/jdk18u/pull/47