Fix: wrong link error message (#28127)

Fixes: #28126

## Bug

- [x] Related issues linked using `fixes #number`
- [x] Integration tests added
- [x] Errors have helpful link attached, see `contributing.md`

packages/next/client/link.tsx

@@ -237,7 +237,7 @@ function Link(props: React.PropsWithChildren<LinkProps>) {
       throw new Error(
         `Multiple children were passed to <Link> with \`href\` of \`${props.href}\` but only one child is supported https://nextjs.org/docs/messages/link-multiple-children` +
           (typeof window !== 'undefined'
-            ? "\nOpen your browser's console to view the Component stack trace."
+            ? " \nOpen your browser's console to view the Component stack trace."
             : '')
       )
     }

test/acceptance/ReactRefreshLogBox.dev.test.js

@@ -1130,6 +1130,16 @@ test('<Link> with multiple children', async () => {
   expect(await session.getRedboxDescription()).toMatchInlineSnapshot(
     `"Error: Multiple children were passed to <Link> with \`href\` of \`/\` but only one child is supported https://nextjs.org/docs/messages/link-multiple-children"`
   )
+  expect(
+    await session.evaluate(
+      () =>
+        document
+          .querySelector('body > nextjs-portal')
+          .shadowRoot.querySelector(
+            '#nextjs__container_errors_desc a:nth-of-type(1)'
+          ).href
+    )
+  ).toMatch('https://nextjs.org/docs/messages/link-multiple-children')
 
   await cleanup()
 })