Update migration guides for v9.1

docs/en/docs-nav.json

@@ -2292,6 +2292,10 @@
             {
               "text": "Tenant impersonation & User impersonation",
               "path": "modules/account/impersonation.md"
+            },
+            {
+              "text": "Idle Session Timeout",
+              "path": "modules/account/idle-session-timeout.md"
             }
           ]
         },

docs/en/modules/account-pro.md

@@ -358,4 +358,4 @@ This module doesn't define any additional distributed event. See the [standard d
 * [Impersonation](./account/impersonation.md)
 * [Linked Accounts](./account/linkedaccounts.md)
 * [Session Management](./account/session-management.md)
-* [Idle Session Timeout](./account/idle-session-timeout.md)]
+* [Idle Session Timeout](./account/idle-session-timeout.md)

docs/en/release-info/migration-guides/abp-9-1.md

@@ -0,0 +1,7 @@
+# ABP Version 9.1 Migration Guide
+
+This document is a guide for upgrading ABP v9.0 solutions to ABP v9.1. There are no breaking changes in this version that would affect your application. 
+
+Only you might need to update some constant names due to the OpenIddict 6.0 upgrade, which is explained in the following migration guide:
+
+- [OpenIddict 5.x to 6.x Migration Guide](./openiddict5-to-6.md)

docs/en/release-info/migration-guides/index.md

@@ -2,6 +2,7 @@
 
 The following documents explain how to migrate your existing ABP applications. We write migration documents only if you need to take an action while upgrading your solution. Otherwise, you can easily upgrade your solution using the [abp update command](../upgrading.md).
 
+- [9.0 to 9.1](abp-9-1.md)
 - [8.x to 9.0](abp-9-0.md)
 - [8.x to 8.3](abp-8-3.md)
 - [8.1 to 8.2](abp-8-2.md)