[DOC] doc: remove references to updateState

doc/component.md

@@ -16,7 +16,7 @@ export class Counter extends Component {
   }
 
   increment(delta) {
-    this.updateState({ counter: this.state.counter + delta });
+    this.state.counter += delta;
   }
 }
 ```
@@ -88,9 +88,6 @@ It is not called on the initial render. This is useful to get some
 information which are in the DOM. For example, the current position of the
 scrollbar
 
-Note that at this point, it is not safe to rerender the widget. In
-particular, updateState calls should be avoided.
-
 ### patched
 
 This hook is called whenever a component did actually update its props,

src/component.ts

@@ -168,9 +168,6 @@ export class Component<
    * It is not called on the initial render.  This is useful to get some
    * information which are in the DOM.  For example, the current position of the
    * scrollbar
-   *
-   * Note that at this point, it is not safe to rerender the widget. In
-   * particular, updateState calls should be avoided.
    */
   willPatch() {}