one more fix

README.md

@@ -80,11 +80,11 @@ This library exposes two functions, `renderToString` and `hydrate`, much like `r
   **`renderToString`** consumes a string of MDX along with any components it utilizes in the format `{ ComponentName: ActualComponent }`. It also can optionally be passed options which are [passed directly to MDX](https://mdxjs.com/advanced/plugins), and a scope object that can be included in the mdx scope. The function returns an object that is intended to be passed into `hydrate` directly.
 
   ```ts
-  renderToString({
+  renderToString(
     // Raw MDX contents as a string
-    source: '# hello, world',
+    '# hello, world',
     // Optional parameters
-    options: {
+    {
       // The `name` is how you will invoke the component in your MDX
       components: { name: React.ComponentType },
       // MDX's available options at time of writing pulled directly from
@@ -97,8 +97,8 @@ This library exposes two functions, `renderToString` and `hydrate`, much like `r
         filepath: '/some/file/path',
       },
       scope: {},
-    },
-  })
+    }
+  )
   ```
 
   Visit <https://github.com/mdx-js/mdx/blob/master/packages/mdx/index.js> for available `mdxOptions`.