solrconfig.xml for 5.x version has <config name> outdated

yep

Thanks for spotting that!
Of course a trivial change, but we should still go through the "correct" channels – i.e., the "Common Configs" project.

@drunken monkey:
you're right for 7.x. Moving this issue to Apache Solr Common Configurations is the right way.

But for 8.x we should consider to declare Apache Solr Common Configurations as obsolete. I recently opened #2677724: Revise all schema.xml files for D8 to remove the parts of schema.xml files that aren't used anymore. These fields mostly came from the Apache Solr project.

Of course, for Drupal 8 the project is obsolete, since there's only a single module anyways. (Though you should still keep an eye on the Common Configs project to adapt any changes made there, if they make sense.)