docs: nextjs missing createClient example code (#21532)

added createClient function example

Co-authored-by: Chris Gwilliams <517923+encima@users.noreply.github.com>

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

@@ -92,6 +92,8 @@ hideToc: true
 
     <StepHikeCompact.Code>
 
+    <CH.Code className="min-h-[34rem]">
+
       ```ts app/notes/page.tsx
         import { createClient } from '@/utils/supabase/server';
 
@@ -103,6 +105,47 @@ hideToc: true
         }
       ```
 
+      ```ts utils/supabase/server.ts
+        import { createServerClient, type CookieOptions } from '@supabase/ssr'
+        import { cookies } from 'next/headers'
+
+        export function createClient() {
+          const cookieStore = cookies()
+
+          return createServerClient(
+            process.env.NEXT_PUBLIC_SUPABASE_URL!,
+            process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,
+            {
+              cookies: {
+                get(name: string) {
+                  return cookieStore.get(name)?.value
+                },
+                set(name: string, value: string, options: CookieOptions) {
+                  try {
+                    cookieStore.set({ name, value, ...options })
+                  } catch (error) {
+                    // The `set` method was called from a Server Component.
+                    // This can be ignored if you have middleware refreshing
+                    // user sessions.
+                  }
+                },
+                remove(name: string, options: CookieOptions) {
+                  try {
+                    cookieStore.set({ name, value: '', ...options })
+                  } catch (error) {
+                    // The `delete` method was called from a Server Component.
+                    // This can be ignored if you have middleware refreshing
+                    // user sessions.
+                  }
+                },
+              },
+            }
+          )
+        }
+      ```
+
+    </CH.Code>
+
     </StepHikeCompact.Code>
 
   </StepHikeCompact.Step>