update: refine Shopee OpenAPI announcement instructions to focus solely on major API changes

Author: nVuln

bin/shopee-openapi-announcement

@@ -46,7 +46,7 @@ $issue_body = <<<MARKDOWN
 {$markdownOutput}
 
 ---
-@junie-agent Please check the changes for this endpoint in Shopee's Openapi Announcement, update the corresponding PHP source code in the repo, and create a new Pull Request for review.
+@junie-agent Please review the API changes described above. Focus **ONLY** on major updates such as adding new endpoints or removing/taking legacy APIs offline. You can safely ignore any other changes regarding request/response parameters or fields. Update the PHP code and create a new PR for review.
 MARKDOWN;
 
 // temporary save issue body to file