fix PHPDoc and other minor issues

build/integration/features/bootstrap/Auth.php

core/Controller/LoginController.php

core/Controller/TokenController.php

lib/private/Authentication/Token/DefaultToken.php

lib/private/Authentication/Token/DefaultTokenProvider.php

lib/private/Authentication/Token/IProvider.php

lib/private/Authentication/Token/IToken.php

lib/private/Files/Filesystem.php

lib/private/Updater.php

lib/private/User/Session.php

lib/private/legacy/api.php

tests/lib/authentication/token/defaulttokenmappertest.php

tests/lib/authentication/token/defaulttokenprovidertest.php

tests/lib/user/session.php