Update fetch.mdx (#24357)

Author: kodster28

src/content/docs/workers/runtime-apis/fetch.mdx

@@ -134,4 +134,5 @@ export default {
 - [Example: Fetch HTML](/workers/examples/fetch-html/)
 - [Example: Fetch JSON](/workers/examples/fetch-json/)
 - [Example: cache using Fetch](/workers/examples/cache-using-fetch/)
-- Write your Worker code in [ES modules syntax](/workers/reference/migrate-to-module-workers/) for an optimized experience.
+- Write your Worker code in [ES modules syntax](/workers/reference/migrate-to-module-workers/) for an optimized experience.
+- [Error 526](/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-526/#error-526-in-the-workers-context)