[MPLUGIN-505] helpmojo: does not respect nested list in javadoc

**[Ernst Reissner](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=ernstreissner)** opened **[MPLUGIN-505](https://issues.apache.org/jira/browse/MPLUGIN-505?redirect=false)** and commented

In https://github.com/Reissner/latex-maven-plugin/blob/master/maven-latex-plugin/src/main/java/eu/simuline/m2latex/mojo/InjectionMojo.java
there is an example of a parameter with documentation containing nested lists.

I create the help with goal `helpmojo`.
I display this with `mvn latex:help -Ddetail -Dgoal=inj`
but this yields a list with one layer only.

Obviously a bug.
In the api doc, all is ok.

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**Affects:** 3.11.0