feat(Modal): add description to Modal

Author: kmcfaul

packages/patternfly-4/react-core/src/components/Modal/Modal.tsx

@@ -44,6 +44,8 @@ export interface ModalProps extends React.HTMLProps<HTMLDivElement> {
   appendTo?: HTMLElement | (() => HTMLElement);
   /** Flag to disable focus trap */
   disableFocusTrap?: boolean;
+  /** Description of the modal */
+  description?: React.ReactNode;
 }
 
 interface ModalState {

packages/patternfly-4/react-core/src/components/Modal/ModalContent.tsx

@@ -30,7 +30,7 @@ export interface ModalContentProps {
   isOpen?: boolean;
   /** Complex header (more than just text), supersedes title for header content */
   header?: React.ReactNode;
-  /** Description */
+  /** Description of the modal */
   description?: React.ReactNode;
   /** Simple text content of the Modal Header, also used for aria-label on the body */
   title: string;