Update typo in url for localhost (aws-amplify#7110)

Author: timngyn

Diff for: src/pages/[platform]/build-a-backend/troubleshooting/library-not-configured/index.mdx

@@ -53,7 +53,7 @@ Make sure you are calling `Amplify.configure` in the root file of your project.
 
 <Callout>
 
-If you are using the Next.js App Router, you can follow the suggestions in our [Next.js documentation](/[platform]/build-a-backend/server-side-rendering/nextjs/#configure-amplify-library-for-client-side-usage) for root-level configuration. Keep in mind that if you are calling any APIs at the module-level (i.e. at the top of your file) in any of the Child components, you may still run into this issue. Continue on the [Check 2](http://localhost:3000/react/build-a-backend/troubleshooting/library-not-configured/#check-2-move-module-level-amplify-api-invocations) if this is the case.
+If you are using the Next.js App Router, you can follow the suggestions in our [Next.js documentation](/[platform]/build-a-backend/server-side-rendering/nextjs/#configure-amplify-library-for-client-side-usage) for root-level configuration. Keep in mind that if you are calling any APIs at the module-level (i.e. at the top of your file) in any of the Child components, you may still run into this issue. Continue on the [Check 2](/[platform]/build-a-backend/troubleshooting/library-not-configured/#check-2-move-module-level-amplify-api-invocations) if this is the case.
 
 </Callout>