docs: remove headers now optional

Signed-off-by: David Dal Busco <david.dalbusco@outlook.com>

Author: peterpeterparker

docs/guides/typescript.mdx

@@ -367,7 +367,6 @@ export const onSetDoc = defineHook<OnSetDoc>({
     const args: HttpRequestArgs = {
       url,
       method: "GET",
-      headers: [],
       // Use a single node as we do not require that a trust level for fetching a dog image for demo purposes. 😉
       isReplicated: false
     };