Update links for C# and F# new versions (#49876)

Author: WeihanLi

docs/whats-new/index.yml

@@ -40,10 +40,10 @@ landingContent:
   linkLists:
   - linkListType: whats-new
     links:
-    - text: What's new in C# 13
-      url: ../csharp/whats-new/csharp-13.md
-    - text: What's new in F# 9
-      url: ../fsharp/whats-new/fsharp-9.md
+    - text: What's new in C# 14
+      url: ../csharp/whats-new/csharp-14.md
+    - text: What's new in F# 10
+      url: ../fsharp/whats-new/fsharp-10.md
     - text: What's new for Visual Basic
       url: ../visual-basic/whats-new/index.md
 - title: Contribute to docs