Build succeeded in Jenkins: Maven TLP » maven-doxia-converter » master #17

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See 
https://builds.apache.org/job/maven-box/job/maven-doxia-converter/job/master/17/

Changes:

* [INFRA-19273] Maven 3.6.0 dropped, update to 3.6.2
* Fix checkstyle reported error (and improve code a bit)

All tests passed