Update index.yml

Fixed wrong link where it was pointing to the documents markdown.

Author: shaggygi

docs/extensibility/visualstudio.extensibility/index.yml

@@ -56,7 +56,7 @@ landingContent:
           - text: Tool windows
             url: ./tool-window/tool-window.md
           - text: User prompts
-            url: ./document/documents.md
+            url: ./user-prompt/user-prompts.md
 
   # Card
   - title: Resources
@@ -82,4 +82,4 @@ landingContent:
       - linkListType: whats-new
         links:
           - text: Announcements
-            url: https://github.com/microsoft/VSExtensibility/blob/main/docs/announcements.md
+            url: https://github.com/microsoft/VSExtensibility/blob/main/docs/announcements.md