(doc) - Add note on dependecy:tree -Dverbose support in 3.0+

[grimsa]

Running mvn dependency:tree -Dverbose as suggested in docs produces non-verbose output and the following warning:

[INFO] --- maven-dependency-plugin:3.0.0:tree (default-cli) @ my-project ---
[INFO] Verbose not supported since maven-dependency-plugin 3.0
...

From what I gather, it was originally reported as MDEP-374 back in 2.8, then a workaround based on Maven2 was introduced only to be removed later with MDEP-494.

This PR updates documentation with a possible workaround.

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[khmarbaise]

Hi, could you please so kind to rebase your PR against most recent master. I appreciate to merge you PR....

[grimsa]

Rebased on master.
Also updated the suggestion to use an older version of the plugin instead of debug flag (-X ).