docs: 添加「如何控制 http 返回 enum（枚举类型）的名称和数字」 (#194)

* docs: 添加「如何控制 http 返回 enum（枚举类型）的名称和数字」

* docs: add en documentation

docs/intro/03-faq.md

@@ -81,3 +81,24 @@ func init() {
 }
 ```
 
+### 11、控制 http 返回 enum（枚举类型）的名称和数字
+
+可以在http服务的main.go中引入
+```
+import (
+  "github.com/go-kratos/kratos/v2/encoding/json"
+  "google.golang.org/protobuf/encoding/protojson"
+)
+```
+在init方法中设置json.MarshalOptions
+```
+func init() {
+	...
+	//增加这段代码
+	json.MarshalOptions = protojson.MarshalOptions{
+		UseEnumNumbers: true, // 将枚举值作为数字发出，默认为枚举值的字符串
+	}
+}
+```
+
+更多控制 http 返回内容，请参考文档：https://pkg.go.dev/google.golang.org/[email protected]/encoding/protojson#MarshalOptions

i18n/en/docusaurus-plugin-content-docs/current/intro/03-faq.md

@@ -81,8 +81,30 @@ func init() {
 }
 ```
 
+### 11、Controls the name and number of the enum (enumeration type) returned by http
 
+You can import it in the `main.go` of the http service
+
+```
+import (
+  "github.com/go-kratos/kratos/v2/encoding/json"
+  "google.golang.org/protobuf/encoding/protojson"
+)
+```
+
+Set `json.MarshalOptions` in the init method
+
+```
+func init() {
+    flag.StringVar(&flagconf, "conf", "../../configs", "config path, eg: -conf config.yaml")
+    // Add this code
+    json.MarshalOptions = protojson.MarshalOptions{
+        UseEnumNumbers: true, // UseEnumNumbers emits enum values as numbers.
+    }
+}
+```
 
+For more control over http return content, please refer to the documentation: https://pkg.go.dev/google.golang.org/[email protected]/encoding/protojson#MarshalOptions