Update link to Babel plugin ordering
Summary:
Seems like the anchor at has changed.
Closes
@@ -31,7 +31,7 @@ Add `"relay"` to the list of plugins your `.babelrc` file:
Please note that the `"relay"` plugin should run before other plugins or
presets to ensure the `graphql` template literals are correctly transformed. See
-Babel's [documentation on this topic](https://babeljs.io/docs/plugins/#plugin-preset-ordering).
+Babel's [documentation on this topic](https://babeljs.io/docs/plugins/#pluginpreset-ordering).
See the [Migration Setup](./migration-setup.html) guide if upgrading an existing Relay app.
