docs: added workflow hooks docs + changed workflow response (#8364)

* docs: added workflow hooks docs + changed workflow response

* Update page.mdx

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

@@ -19,14 +19,15 @@ Since if-conditions aren't allowed in the workflow constructor function, use the
 For example:
 
 export const highlights = [
-  ["15", "input", "The data to pass as a parameter to the function in the second parameter"],
-  ["17", "return", "The function must return a boolean value indicating whether\nthe callback function passed to `then` should be executed."],
-  ["19", "() => {", "The function to execute if `when`'s second parameter returns a `true` value."]
+  ["16", "input", "The data to pass as a parameter to the function in the second parameter"],
+  ["18", "return", "The function must return a boolean value indicating whether\nthe callback function passed to `then` should be executed."],
+  ["20", "() => {", "The function to execute if `when`'s second parameter returns a `true` value."]
 ]
 
 ```ts highlights={highlights}
 import { 
   createWorkflow,
+  WorkflowResponse,
   when,
 } from "@medusajs/workflows-sdk"
 // step imports...
@@ -49,7 +50,11 @@ const workflow = createWorkflow(
     })
 
     // executed without condition
-    return anotherStep(result)
+    const anotherStepResult = anotherStep(result)
+
+    return new WorkflowResponse(
+      anotherStepResult
+    )
   }
 )
 ```