docs: Fix DenoCron reference in docs for Deno.cron (#8743)

Author: andrewrosss

src/platform-includes/crons/setup/javascript.deno.mdx

@@ -9,7 +9,7 @@ import * as Sentry from "https://deno.land/x/sentry/index.mjs";
 
 Sentry.init({
   dsn: "___PUBLIC_DSN___",
-  integrations: [new Sentry.DenoCron()],
+  integrations: [new Sentry.Integrations.DenoCron()],
 });
 ```