docs: Fix SvelteKit quickstart env variables prefix (supabase#39935) (supabase#39936)

Co-authored-by: Chris Chinchilla <[email protected]>

Author: olegpolin

apps/docs/content/guides/getting-started/quickstarts/sveltekit.mdx

@@ -67,8 +67,8 @@ hideToc: true
       <$CodeTabs>
 
         ```text name=.env
-        PUBLIC_VITE_SUPABASE_URL=<SUBSTITUTE_SUPABASE_URL>
-        PUBLIC_VITE_SUPABASE_PUBLISHABLE_KEY=<SUBSTITUTE_SUPABASE_PUBLISHABLE_KEY>
+        PUBLIC_SUPABASE_URL=<SUBSTITUTE_SUPABASE_URL>
+        PUBLIC_SUPABASE_PUBLISHABLE_KEY=<SUBSTITUTE_SUPABASE_PUBLISHABLE_KEY>
         ```
 
       </$CodeTabs>
@@ -89,17 +89,17 @@ hideToc: true
       <$CodeTabs>
 
         ```js name=src/lib/supabaseClient.js
-          import { createClient } from '@supabase/supabase-js';
-        import { PUBLIC_VITE_SUPABASE_URL, PUBLIC_VITE_SUPABASE_PUBLISHABLE_KEY } from '$env/static/public';
+        import { createClient } from '@supabase/supabase-js';
+        import { PUBLIC_SUPABASE_URL, PUBLIC_SUPABASE_PUBLISHABLE_KEY } from '$env/static/public';
 
-        export const supabase = createClient(PUBLIC_VITE_SUPABASE_URL, PUBLIC_VITE_SUPABASE_PUBLISHABLE_KEY)
+        export const supabase = createClient(PUBLIC_SUPABASE_URL, PUBLIC_SUPABASE_PUBLISHABLE_KEY)
         ```
 
         ```ts name=src/lib/supabaseClient.ts
-          import { createClient } from '@supabase/supabase-js';
-        import { PUBLIC_VITE_SUPABASE_URL, PUBLIC_VITE_SUPABASE_PUBLISHABLE_KEY } from '$env/static/public';
+        import { createClient } from '@supabase/supabase-js';
+        import { PUBLIC_SUPABASE_URL, PUBLIC_SUPABASE_PUBLISHABLE_KEY } from '$env/static/public';
 
-        export const supabase = createClient(PUBLIC_VITE_SUPABASE_URL, PUBLIC_VITE_SUPABASE_PUBLISHABLE_KEY)
+        export const supabase = createClient(PUBLIC_SUPABASE_URL, PUBLIC_SUPABASE_PUBLISHABLE_KEY)
         ```
 
       </$CodeTabs>