docs: fix incorrect .js extension with .ts extension (#19925)

* docs: fix incorrect .js extension with .ts extension

Within the SvelteKit example, the guide incorrectly references creating a .js file as opposed to a .ts as is required, given the contents of said file has Typescript within it

* Update apps/docs/pages/guides/auth/server-side/email-based-auth-with-pkce-flow-for-ssr.mdx

* run formatter

---------

Co-authored-by: Charis <26616127+charislam@users.noreply.github.com>
Co-authored-by: dshukertjr <dshukertjr@gmail.com>

apps/docs/content/guides/auth/server-side/email-based-auth-with-pkce-flow-for-ssr.mdx

@@ -75,30 +75,30 @@ export async function GET(request: NextRequest) {
 </TabPanel>
 <TabPanel id="sveltekit" label="SvelteKit">
 
-Create a new file at `src/routes/auth/confirm/+server.js` and populate with the following:
+Create a new file at `src/routes/auth/confirm/+server.ts` and populate with the following:
 
-```js src/routes/auth/confirm/+server.js
-import { redirect } from '@sveltejs/kit';
+```ts src/routes/auth/confirm/+server.ts
+import { redirect } from '@sveltejs/kit'
 
 export const GET = async (event) => {
-	const {
-		url,
-		locals: { supabase }
-	} = event;
-	const token_hash = url.searchParams.get('token_hash') as string;
-	const type = url.searchParams.get('type') as string;
-	const next = url.searchParams.get('next') ?? '/';
+  const {
+    url,
+    locals: { supabase },
+  } = event
+  const token_hash = url.searchParams.get('token_hash') as string
+  const type = url.searchParams.get('type') as string
+  const next = url.searchParams.get('next') ?? '/'
 
   if (token_hash && type) {
-    const { error } = await supabase.auth.verifyOtp({ token_hash, type });
+    const { error } = await supabase.auth.verifyOtp({ token_hash, type })
     if (!error) {
-      throw redirect(303, `/${next.slice(1)}`);
+      throw redirect(303, `/${next.slice(1)}`)
     }
   }
 
   // return the user to an error page with some instructions
-  throw redirect(303, '/auth/auth-code-error');
-};
+  throw redirect(303, '/auth/auth-code-error')
+}
 ```
 
 </TabPanel>