[MNG-8488] Finish javadoc for Maven 4 API

[jira-importer]

Elliotte Rusty Harold opened MNG-8488 and commented

Probably half or more of classes, methods, and modules have no doc comments, and speaking as a reader of the code, these are not nearly as self evident as the original author probably thought they were. These all need to be filled in.

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Issue Links:

• MNG-8485 Finalize Maven 4 API