Revert specificy parameter type as it creates false negative documentation bug.

Author: cdujeu

core/src/core/classes/class.AJXP_MetaStreamWrapper.php

@@ -126,7 +126,7 @@ protected static function actualRepositoryWrapperData($repositoryId){
 
     /**
      * Return the final ajxp.XX wrapper class name.
-     * @param string $repositoryId
+     * @param $repositoryId
      * @return string mixed
      * @throws Exception
      */