Make option a callback, update docs

docs/api/nodes/task-item.md

@@ -4,6 +4,7 @@ icon: task-line
 ---
 
 # TaskItem
+
 [![Version](https://img.shields.io/npm/v/@tiptap/extension-task-item.svg?label=version)](https://www.npmjs.com/package/@tiptap/extension-task-item)
 [![Downloads](https://img.shields.io/npm/dm/@tiptap/extension-task-item.svg)](https://npmcharts.com/compare/@tiptap/extension-task-item?minimal=true)
 
@@ -12,6 +13,7 @@ This extension renders a task item list element, which is a `<li>` tag with a `d
 This extension doesn’t require any JavaScript framework, it’s based on Vanilla JavaScript.
 
 ## Installation
+
 ```bash
 npm install @tiptap/extension-task-list @tiptap/extension-task-item
 ```
@@ -21,6 +23,7 @@ This extension requires the [`TaskList`](/api/nodes/task-list) node.
 ## Settings
 
 ### HTMLAttributes
+
 Custom HTML attributes that should be added to the rendered HTML tag.
 
 ```js
@@ -31,7 +34,32 @@ TaskItem.configure({
 })
 ```
 
+### nested
+
+Whether the task items are allowed to be nested within each other.
+
+```js
+TaskItem.configure({
+  nested: true,
+})
+```
+
+### onReadOnlyChecked
+
+A handler for when the task item is checked or unchecked while the editor is set to `readOnly`.
+
+If this is not supplied, the task items are immutable while the editor is `readOnly`.
+
+```js
+TaskItem.configure({
+  onReadOnlyChecked: (node, checked) => {
+    // do something
+  },
+})
+```
+
 ## Keyboard shortcuts
+
 | Command         | Windows/Linux      | macOS              |
 | --------------- | ------------------ | ------------------ |
 | splitListItem() | `Enter`            | `Enter`            |
@@ -39,7 +67,9 @@ TaskItem.configure({
 | liftListItem()  | `Shift`&nbsp;`Tab` | `Shift`&nbsp;`Tab` |
 
 ## Source code
+
 [packages/extension-task-item/](https://github.com/ueberdosis/tiptap/blob/main/packages/extension-task-item/)
 
 ## Usage
+
 https://embed.tiptap.dev/preview/Nodes/TaskItem