RFR: 8302981: Fix a typo in the doc comment for java.lang.Record.equals

[Pavel Rappo]

Please review this trivial fix.

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/12689/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12689&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302981
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/12689.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12689/head:pull/12689

PR: https://git.openjdk.org/jdk/pull/12689