I agree with Jonathan (and Shawn on the Jetty explanation), I think the docs should make this a bit more clear - I notice many people choosing Tomcat and then learning these details after, possibly regretting it.
I'd be glad to modify the docs but I want to be careful how it is worded. Is it fair to go as far as saying Jetty is 100% THE "recommended" container for Solr, or should a recommendation be avoided, and maybe just a list of pros/cons? Cheers, Tim