Fix schema

Signed-off-by: David Gageot <david.gageot@docker.com>

Author: dgageot

agent-schema.json

@@ -1,8 +1,8 @@
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
   "$id": "https://github.com/docker/docker-agent/blob/main/agent-schema.json",
-  "title": "Cagent Configuration",
-  "description": "Configuration schema for Cagent v5",
+  "title": "Docker Agent Configuration",
+  "description": "Configuration schema for Docker Agent v6",
   "type": "object",
   "properties": {
     "version": {