Update langfuse-observability listing description (#3802)

.claude-plugin/marketplace.json

@@ -1672,7 +1672,7 @@
     },
     {
       "name": "langfuse-observability",
-      "description": "The Langfuse x Claude Code Observability Plugin",
+      "description": "Langfuse observability plugin for Claude Code — captures and exports traces, spans, and session telemetry from Claude Code to Langfuse for LLM monitoring, debugging, and evaluation",
       "author": {
         "name": "Langfuse"
       },