This fixes the build failure, which logged:
ERROR (.../en/reference/solr/solrmissingmandatoryparameterexception.xml:58:66)
&reference.solr.entities.solrmissingmandatoryparameterexception;
------------------------------------------------------------------^
Entity 'reference.solr.entities.solrmissingmandatoryparameterexception' not
defined
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@344523 c90b9560-bf6c-de11-be94-00142212c4b1
