Refs #4200 revised some of class/method docs.

core/API/Request.php

core/ArchiveProcessor.php

core/ArchiveProcessor/Parameters.php

core/Common.php

core/DataAccess/LogAggregator.php

core/DataTable.php

core/Db.php

core/Filesystem.php

core/FrontController.php

core/IP.php

core/Nonce.php

core/Notification.php

core/Option.php

core/Period.php

core/Plugin/API.php

core/Plugin/Archiver.php

core/Plugin/ConsoleCommand.php

core/Plugin/Controller.php

core/Plugin/ControllerAdmin.php

core/Plugin/Manager.php