docs: update README with threadId parameter

Author: plwalters

README.md

@@ -1092,6 +1092,7 @@ The following sets of tools are available:
   - `owner`: Repository owner (string, required)
   - `pullNumber`: Pull request number (number, required)
   - `repo`: Repository name (string, required)
+  - `threadId`: The node ID of the review thread (e.g., PRRT_kwDOxxx). Required for resolve_thread and unresolve_thread methods. Get thread IDs from pull_request_read with method get_review_comments. (string, optional)
 
 - **request_copilot_review** - Request Copilot review
   - **Required OAuth Scopes**: `repo`