RFR: 8259540: MissingResourceException for key cvc-complex-type.2.4.d.1

[Alexey Bakhtin]

Please find a trivial fix for the missing `cvc-complex-type.2.4.d.1` resource in the main XMLSchemaMessages.properties file.

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Commit messages:
 - 8259540: MissingResourceException for key cvc-complex-type.2.4.d.1

Changes: https://git.openjdk.org/jdk/pull/24747/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24747&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8259540
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24747.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24747/head:pull/24747

PR: https://git.openjdk.org/jdk/pull/24747