[DOC] add example of inline statement in main doc

tools/playground/samples.js

@@ -466,10 +466,6 @@ class TodoItem extends Component {
         useAutofocus("input");
     }
 
-    editTodo() {
-        this.state.isEditing = true;
-    }
-
     handleKeyup(ev) {
         if (ev.keyCode === ENTER_KEY) {
             this.updateTitle(ev.target.value);
@@ -603,7 +599,7 @@ const TODO_APP_STORE_XML = `<templates>
   <li t-name="TodoItem" class="todo" t-att-class="{completed: props.completed, editing: state.isEditing}">
     <div class="view">
       <input class="toggle" type="checkbox" t-on-change="dispatch('toggleTodo', props.id)" t-att-checked="props.completed"/>
-      <label t-on-dblclick="editTodo">
+      <label t-on-dblclick="state.isEditing = true">
         <t t-esc="props.title"/>
       </label>
       <button class="destroy" t-on-click="dispatch('removeTodo', props.id)"></button>