docs(item-divider, thumbnail): update todo

Author: thetaPC

core/src/components/item-divider/item-divider.scss

@@ -253,7 +253,7 @@
 // --------------------------------------------------
 
 ::slotted(ion-thumbnail) {
-  // TODO(): separate width and height tokens for thumbnails
+  // TODO(FW-6862): separate width and height tokens for thumbnails
   --size: var(--ion-item-divider-thumbnail-width);
 
   @include mixins.margin(

core/src/components/thumbnail/thumbnail.scss

@@ -8,8 +8,7 @@
    * @prop --border-radius: Border radius of the thumbnail
    * @prop --size: Size of the thumbnail
    */
-  // TODO(): separate width and height tokens for thumbnails
-  --size: 48px;
+  --size: 48px; // TODO(FW-6862): separate width and height tokens for thumbnails
   --border-radius: 0;
 
   @include border-radius(var(--border-radius));