RFR: 8340537: Typo in javadoc of java.util.jar.JarFile

[Jaikiran Pai]

Can I please get a review of this trivial typo fix in `JarFile` class' javadoc?

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Commit messages:
 - 8340537: Typo in javadoc of java.util.jar.JarFile

Changes: https://git.openjdk.org/jdk/pull/21108/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21108&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340537
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21108.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21108/head:pull/21108

PR: https://git.openjdk.org/jdk/pull/21108