docs: remove limitation on arrow functions in workflows (#7958)

www/apps/book/app/advanced-development/workflows/constructor-constraints/page.mdx

@@ -6,30 +6,6 @@ export const metadata = {
 
 This chapter lists some constraints to keep in mind when defining a workflow's constructor function.
 
-## No Arrow Functions
-
-The function passed to the `createWorkflow` function can’t be an arrow function:
-
-```ts highlights={[["5", "=>", "Function can't be an arrow function"], ["13", "", "Correct way of defining the function."]]}
-// Don't
-const myWorkflow = createWorkflow<
-  WorkflowInput,
-  WorkflowOutput
->("hello-world", (input) => {
-  // ...
-})
-
-// Do
-const myWorkflow = createWorkflow<
-  WorkflowInput,
-  WorkflowOutput
->("hello-world", function (input) {
-  // ...
-})
-```
-
----
-
 ## No Async Functions
 
 The function passed to the `createWorkflow` can’t be an async function: