Fix warning "'reportOutputDirectory' is unknown for plugin 'maven-javadoc-plugin:3.11.1:jar (attach-javadocs)'" (#1776) `reportOutputDirectory` parameter was removed in maven-javadoc-plugin version 3.10.0 by https://github.com/apache/maven-javadoc-plugin/commit/9638a6a76c6db53c3bf8ffbd5cec7318b0e25303 (https://issues.apache.org/jira/browse/MJAVADOC-785). This was overlooked in commit 435579f27cb8259ba14c1a868245a843e053211f. `outputDirectory` parameter can be used to restore prior behavior, but this customization seems unnecessary.
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