docs: add upgrade guide for iOS 0.11.0 (#276)

website/docs/for-ios/upgrade-guides.md

@@ -6,6 +6,16 @@ sidebar_label: Upgrade Guides
 import Tabs from '@theme/Tabs';
 import TabItem from '@theme/TabItem';
 
+## Portals for iOS 0.10.x → 0.11.0
+
+- Portals for iOS version `0.11.0` is compatible with Portals Web Plugin version `0.10.x`.
+
+:::caution
+Portals 0.11.0 is a notable update that upgrades the Capacitor dependency to version 6. Care should be taken to update dependencies across your web content and native apps to ensure compatibility.
+:::
+
+First review the [Capacitor 6 Update Guide](https://capacitorjs.com/docs/updating/6-0#ios) for an overview of necessary changes. Some will not be relevant for Portals apps, but this will be a useful reference in case you encounter issues with your upgrade.
+
 ## Portals for iOS 0.9.x → 0.10.0
 
 - Portals for iOS version `0.10.0` is compatible with Portals Web Plugin versions `0.8.0` and up.