Update workers-api.mdx

Author: elithrar

src/content/docs/workflows/build/workers-api.mdx

@@ -189,7 +189,7 @@ return Response.json({
 
 Returns a `WorkflowInstance`.
 
-<Render file="workflows-type-parameters">
+<Render file="workflows-type-parameters"/>
 
 To provide an optional type parameter to the `Workflow`, pass a type argument with your type when defining your Workflow bindings: