Fix EF8 links (#4184)

Author: ajcvickers

entity-framework/core/what-is-new/ef-core-8.0/plan.md

@@ -2,7 +2,7 @@
 title: Plan for Entity Framework Core 8
 description: The themes and features planned for EF Core 8
 author: ajcvickers
-ms.date: 12/13/2022
+ms.date: 12/14/2022
 uid: core/what-is-new/ef-core-8.0/plan
 ---
 
@@ -157,4 +157,4 @@ EF Core GitHub issues are all assigned to one or more "areas". The queries below
 
 ## Suggestions
 
-Your feedback on planning is important. Please comment on [GitHub Issue #26994](https://github.com/dotnet/efcore/issues/26994) with any feedback or general suggestions about the plan. The best way to indicate the importance of an issue is to vote (👍) for that [issue on GitHub](https://github.com/dotnet/efcore/issues). This data will then feed into the [planning process](xref:core/what-is-new/release-planning) for the next release.
+Your feedback on planning is important. Please comment on [GitHub Issue #29853](https://github.com/dotnet/efcore/issues/29853) with any feedback or general suggestions about the plan. The best way to indicate the importance of an issue is to vote (👍) for that [issue on GitHub](https://github.com/dotnet/efcore/issues). This data will then feed into the [planning process](xref:core/what-is-new/release-planning) for the next release.

entity-framework/toc.yml

@@ -35,7 +35,7 @@
     - name: "Breaking changes in EF Core 7.0 (EF7)"
       href: /ef/core/what-is-new/ef-core-7.0/breaking-changes
     - name: "The plan for EF Core 8 (EF8)"
-      href: /ef/core/what-is-new/ef-core-8.0/whatsnew
+      href: /ef/core/what-is-new/ef-core-8.0/plan
     - name: Getting started
       items:
       - name: EF Core Overview
@@ -64,7 +64,15 @@
         href: core/what-is-new/index.md
       - name: Release planning process
         href: core/what-is-new/release-planning.md
-      - name: EF Core 7.0
+      - name: EF Core 8 (EF8)
+        items:
+          - name: High-level plan
+            href: core/what-is-new/ef-core-8.0/plan.md
+          - name: "What's new?"
+            href: core/what-is-new/ef-core-8.0/whatsnew.md
+          - name: Breaking changes
+            href: core/what-is-new/ef-core-8.0/breaking-changes.md
+      - name: EF Core 7.0 (EF7)
         items:
           - name: High-level plan
             href: core/what-is-new/ef-core-7.0/plan.md