(docs)Fix reference to duckduckgo.RegionWT in duckduckgo.Config。修复duckduckgo.Config 里的RegionWT 配置参数 。 (#1475)

Author: lonelymeko

content/zh/docs/eino/ecosystem_integration/tool/tool_duckduckgo_search.md

@@ -23,7 +23,7 @@ import "github.com/cloudwego/eino-ext/components/tool/duckduckgo/v2"
 tool, err := duckduckgo.NewTextSearchTool(ctx, &duckduckgo.Config{
     ToolName:    "duckduckgo_search",     
     ToolDesc:    "search for information by duckduckgo",
-    Region:      ddgsearch.RegionWT,      // The geographical region for results.
+    Region:      duckduckgo.RegionWT,      // The geographical region for results.
     MaxResults:  3,                      // Limit the number of results returned.
 })
 ```