Update aws-startup-advisor listing description (#2305)

Refreshes the marketplace listing description for the AWS Startup Advisor
plugin at the maintainer's request.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -357,7 +357,7 @@
     },
     {
       "name": "aws-startup-advisor",
-      "description": "Skills for startups building on AWS: an Activate knowledge base (FAQ, credits, programs, partner offers, sample architectures, 277+ learn articles), a prompt library of 29+ copy-paste prompts plus installable agents, and an interactive discovery workflow that scaffolds an AWS architecture.",
+      "description": "Personalized architecture, cost, security, and migration guidance for startups. From day-one account setup and security baselines to production-ready infrastructure, cost optimization, and beyond. Includes AWS Activate Credits eligibility, 60+ exclusive startup offers, and multi-account multi-region support. Built on expertise from AWS Startup Solutions Architects and patterns from 350,000+ startups.",
       "author": {
         "name": "Amazon Web Services"
       },