Remove extra env. from fixed auth bearer

Author: RebeccaTamachiro

src/content/docs/secrets-store/integrations/workers.mdx

@@ -158,7 +158,7 @@ export default {
 		const APIkey = await env.MY_SECRET_NAME.get()
 
     const response = await fetch("https://api.example.com/data", {
-      headers: { "Authorization": `Bearer ${env.APIKey}` },
+      headers: { "Authorization": `Bearer ${APIKey}` },
     });
 
     if (!response.ok) {