[MSITE-1007] Review "Configuring the Site Descriptor" for new site model and behavior

**[Michael Osipov](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=michael-o)** opened **[MSITE-1007](https://issues.apache.org/jira/browse/MSITE-1007?redirect=false)** and commented

https://maven.apache.org/plugins/maven-site-plugin/examples/sitedescriptor.html refers to old model


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**Affects:** 3.21.0, 4.0.0-M14
