Update _generate-agents-md.mdx

Author: ofriw

website/shared-prompts/_generate-agents-md.mdx

@@ -11,7 +11,7 @@ how auth works, testing conventions, coding style, and deployment process.
 Use ArguSeek to fetch current best practices for the tech stack used and the
 latest security guidelines.
 
-Create a concise file (≤500 lines) with sections:
+Create a concise file (≤200 lines) with sections:
 - Tech Stack
 - Development Commands (modified for non-interactive execution)
 - Architecture (high-level structure)