adds note about maven catalogue file to tutorial (#11421)

documentation/tutorial.adoc

@@ -104,6 +104,9 @@ image::img/projectWizard2-top.jpg[width=70%]
 You can first try to find it using the filtering function.
 +
 If Eclipse has not yet indexed the archetype catalog, you need to manually add the archetype details.
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+TIP: Some Eclipse installations do not automatically add Maven Central to the list of Maven catalogues, resulting in the Vaadin archetypes not being available in the wizard. To fix this, open Eclipse Preferences > Maven > Archetypes and select `Add Remote Catalog`. The URL to the Maven Central catalog file is `http://repo1.maven.org/maven2/archetype-catalog.xml`. After applying the changes, the Vaadin archetypes should be available in the wizard.
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 // +
 // .Adding a new archetype
 // image::img/projectWizard2-add.jpg[width=70%]