RFR: 8315116: fix minor issue in copyright header introduced by JDK-8269957 that is breaking the build

Mon Aug 28 15:35:26 UTC 2023

The copyright header of new file: `src/jdk.compiler/share/classes/com/sun/tools/javac/util/Utf8NameTable.java` introduced by the fix for `JDK-8269957` is missing a `,` after the copyright year.

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Commit messages:
 - 8315116: fix minor issue in copyright header introduced by JDK-8269957 that is breaking the build

Changes: https://git.openjdk.org/jdk/pull/15450/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15450&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315116
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15450.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15450/head:pull/15450

PR: https://git.openjdk.org/jdk/pull/15450