Fix typo: "suing" to "using" in Docker Agent config reference

Fixes #24570

Author: lacatoire

content/manuals/ai/docker-agent/reference/config.md

@@ -6,7 +6,7 @@ keywords: [ai, agent, cagent, configuration, yaml]
 weight: 10
 ---
 
-This reference documents the YAML configuration file format for agents suing Docker Agent.
+This reference documents the YAML configuration file format for agents using Docker Agent.
 It covers file structure, agent parameters, model configuration, toolset setup,
 and RAG sources.