RFR: 8297680: JavaDoc example for PseudoClass has minor typo

[Karthik P K]

Fixed the typo in JavaDoc example code for PseudoClass

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Commit messages:
 - Fix typo in JavaDoc example for PseudoClass

Changes: https://git.openjdk.org/jfx/pull/964/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=964&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297680
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/964.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/964/head:pull/964

PR: https://git.openjdk.org/jfx/pull/964