SORRY, NO MATCH FOUND!!!
http://cmsdoxygen.web.cern.ch/3_1_0_pre4/doc/html/classAlignmentProducer.html

Either there is no documenation for that release or the query syntax is faulty, please check it out:
cat /eos/project/c/cmsweb/www/cmssdt/doxygenCMSSW_3_1_0_pre4/*.index | egrep "classAlignmentProducer\.html"