Adding clarification for assets-only workers

Author: Oxyjun

src/content/docs/workers/wrangler/configuration.mdx

@@ -100,7 +100,7 @@ Inheritable keys are configurable at the top-level, and can be inherited (or ove
 
 At a minimum, the `name`, `main` and `compatibility_date` keys are required to deploy a Worker.
 
-If a Worker uses [static assets](/workers/static-assets/) (and therefore the Wrangler file specifies the assets directory), the `main` key is optional.
+The `main` key is optional for assets-only Workers.
 :::
 
 - `name` <Type text="string" /> <MetaInfo text="required" />