docs(input): update setFocus description (#26487)

Co-authored-by: Evan Kleiner <ekleiner@synap.io>

core/src/components/input/input.tsx

@@ -305,6 +305,9 @@ export class Input implements ComponentInterface {
   /**
    * Sets focus on the native `input` in `ion-input`. Use this method instead of the global
    * `input.focus()`.
+   *
+   * Developers who wish to focus an input when a page enters
+   * should call `setFocus()` in the `ionViewDidEnter()` lifecycle method.
    */
   @Method()
   async setFocus() {