[Fix] Incorrect error message for MDX peer dependency (#5617)

* fix: out-of-date MDX error message

* chore: changeset

.changeset/red-nails-mix.md

@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Fix error message when using Content Collections and an out-of-date `@astrojs/mdx` integration

packages/astro/src/content/internal.ts

@@ -138,9 +138,7 @@ async function render({
 	});
 
 	if (!mod._internal && id.endsWith('.mdx')) {
-		throw new Error(
+		throw new Error(`[Content] Failed to render MDX entry. Try installing @astrojs/mdx@latest`);
-			`[Content] Failed to render MDX entry. Try installing @astrojs/mdx@next--content-schemas`
-		);
 	}
 	return {
 		Content,