fix: Make DSN snippet clickable (#12085)

Author: chargome

docs/platforms/unreal/index.mdx

@@ -116,9 +116,10 @@ PublicDependencyModuleNames.AddRange(new string[] { ..., "Sentry" });
 
 The minimum configuration required is the [DSN](/product/sentry-basics/dsn-explainer/) of your project:
 
-
-``` {tabTitle: Public DSN}
-___PUBLIC_DSN___
+```json {tabTitle: Public DSN}
+{
+  "public-dsn": "___PUBLIC_DSN___"
+}
 ```
 
 <Note>