RFR: 8298323: trivial typo in JOptionPane.OK_OPTION

[Prasanta Sadhukhan]

Typo rectified

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Commit messages:
 - trivial typo in JOptionPane.OK_OPTION

Changes: https://git.openjdk.org/jdk/pull/11578/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11578&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298323
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11578.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11578/head:pull/11578

PR: https://git.openjdk.org/jdk/pull/11578