message: docs(theming): update css-utilities to use classes
  Flex Item Properties changed to the new CSS utility classes
diff: @@ -599,17 +599,17 @@ The default amount of `margin` to be applied is `16px` and is set by the `--ion-
  ```html
  <ion-grid>
  <ion-row>
  - <ion-col align-self-start>
  + <ion-col class="ion-align-self-start">
  <div>
  1 of 4
  </div>
  </ion-col>
  - <ion-col align-self-center>
  + <ion-col class="ion-align-self-center">
  <div>
  2 of 4
  </div>
  </ion-col>
  - <ion-col align-self-end>
  + <ion-col class="ion-align-self-end">
  <div>
  3 of 4
  </div>
  