feat(svelte): additional switch for v5/v4 (#13165)

Author: constantinius

docs/platforms/javascript/guides/svelte/index.mdx

@@ -131,7 +131,18 @@ Once you've done this, the SDK will automatically capture unhandled errors and p
 
 This snippet includes an intentional error, so you can test that everything is working as soon as you set it up.
 
-```jsx {tabTitle:Svelte} {filename:SomeCmponent.svelte}
+```jsx {tabTitle:Svelte v5+} {filename:SomeCmponent.svelte}
+<button
+  type="button"
+  onclick={() => {
+    throw new Error("Sentry Frontend Error");
+  }}
+>
+  Throw error
+</button>
+```
+
+```jsx {tabTitle:Svelte v3/v4} {filename:SomeCmponent.svelte}
 <button
   type="button"
   on:click={() => {