Update Sourcegraph Amp module description to highlight unique capabilities

Co-authored-by: Amp <amp@ampcode.com>
Amp-Thread-ID: https://ampcode.com/threads/T-fc5ffd82-b7c3-43e0-aa13-617a74b2bb4c

Author: matifali

registry/coder-labs/modules/sourcegraph-amp/README.md

@@ -1,7 +1,7 @@
 ---
 display_name: Sourcegraph AMP
 icon: ../../../../.icons/sourcegraph-amp.svg
-description: Run Sourcegraph AMP CLI in your workspace with AgentAPI integration
+description: Sourcegraph's AI coding agent with deep codebase understanding and intelligent code search capabilities
 verified: false
 tags: [agent, sourcegraph, amp, ai, tasks]
 ---