update ios migrating doc category and hide tag

Author: michelle-luna

jekyll/_cci2/ios-migrating-from-1-2.md

@@ -3,9 +3,8 @@ layout: classic-docs
 title: "Migrating Your iOS Project From 1.0 to 2.0"
 short-title: "Migrating your iOS project from 1.0 to 2.0"
 description: "How to migrate your iOS project from CircleCI 1.0 to 2.0"
-categories: [migration]
-hide: true
-order: 16
+categories: [platforms]
+order: 10
 ---
 
 This document will give you the guidelines for migrating your iOS