set size for Markdown help modal

packages/app/src/components/PageEditor/Editor.tsx

@@ -246,7 +246,7 @@ const Editor: ForwardRefRenderFunction<IEditorMethods, EditorPropsType> = (props
     };
 
     return (
-      <Modal isOpen={isCheatsheetModalShown} toggle={hideCheatsheetModal} className={`modal-gfm-cheatsheet ${styles['modal-gfm-cheatsheet']}`} >
+      <Modal isOpen={isCheatsheetModalShown} toggle={hideCheatsheetModal} className={`modal-gfm-cheatsheet ${styles['modal-gfm-cheatsheet']}`} size={'lg'} >
         <ModalHeader tag="h4" toggle={hideCheatsheetModal} className="bg-primary text-light">
           <i className="icon-fw icon-question" />Markdown help
         </ModalHeader>