Update workflows documentation (#22356)

## Summary

Documentation-only updates to the workflow and logic-function docs:

- **Code action ↔ logic functions**: clarify that each Code action is
backed by its own logic function, and document how to reuse logic across
workflows via `workflowActionTriggerSettings` (Code/User Guide + Logic
Functions/Developer docs cross-linked).
- **`workflowActionTriggerSettings` example**: add a complete example
(`label`, `icon`, `inputSchema`, `outputSchema`) and document the
previously-undocumented `outputSchema` field.
- **Iterator improvements** (docs for #22031): document the new **"Use
the whole item"** (reference the whole current item) and **"Whole
list"** (loop over a step's top-level array output) options across the
Iterator and array-handling guides.

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packages/twenty-docs/user-guide/workflows/capabilities/use-iterator.mdx

@@ -23,6 +23,12 @@ Iterator expects an **array** as input. It then:
 3. Moves to the next item
 4. Repeats until all items are processed
 
+### Selecting the array to loop over
+
+Most array sources (Search Records, a webhook array field, a Bulk manual trigger) can be selected directly in the variable picker.
+
+When a **Code** or **Logic Function** step returns a *top-level array*, its output appears in the variable picker as indexed entries (`0`, `1`, `2`, …). To loop over the array as a whole, select the **Whole list** option for that step — the Iterator then infers the shape of each item from the list automatically.
+
 ## Basic Setup
 
 ### Example: Email Everyone in Search Results
@@ -76,6 +82,8 @@ Inside Iterator, use `{{iterator.currentItem}}` to access the current record:
 | `{{iterator.currentItem.company.name}}` | Related company name |
 | `{{iterator.index}}` | Current position in array (0-based) |
 
+In the variable picker, you can either drill into a specific field of the current item, or pick **Use the whole item** to reference the entire current item (`{{iterator.currentItem}}`). Selecting the whole item is handy when you want to pass a full record straight into a downstream step rather than rebuilding it field by field.
+
 ## Common Patterns
 
 ### Update Multiple Records