Javadoc was not updated to reflect that :tree's verbose option is now ok

The TreeMojo's verbose option has been broken for a while but was corrected a while ago. Nevertheless, the javadoc has not been updated to reflect that it is useable again.

Many people, including me, may have been discouraged to use it due to this broken javadoc.

ThomGeg has wrote here an extensive history analysis to what happened: https://github.com/CycloneDX/cyclonedx-maven-plugin/pull/187#issuecomment-1130859621