missing semi-colon that parcel upgrade and docs-differ revealed (#2705)

Author: ktabors

packages/@react-aria/ssr/docs/useIsSSR.mdx

@@ -50,5 +50,5 @@ import {useIsSSR} from '@react-aria/ssr';
 function MyComponent() {
   let isSSR = useIsSSR();
   return <span>{isSSR ? 'Server' : 'Client'}</span>;
-}
+};
 ```

packages/@react-aria/utils/docs/mergeProps.mdx

@@ -73,5 +73,5 @@ let merged = {
     a.onKeyDown(e);
     b.onKeyDown(e);
   }
-}
+};
 ```