Added deprecated flag

Author: Eric Olkowski

packages/react-core/src/deprecated/components/Modal/examples/Modal.md

@@ -4,6 +4,7 @@ section: components
 cssPrefix: pf-v5-c-modal-box
 propComponents: ['Modal']
 ouia: true
+deprecated: true
 ---
 
 import { Modal as ModalDeprecated, ModalVariant as ModalVariantDeprecated } from '@patternfly/react-core/deprecated';