doc: 增加示例说明

Author: ArgoZhang

src/BootstrapBlazor.Server/Locales/en-US.json

@@ -3146,6 +3146,7 @@
     "SelectsEnumDescription2": "Setting <code>PalceHolder</code> is not valid when the binding value is an enumerated type",
     "SelectsEnumSelectText1": "Can be empty",
     "SelectsEnumSelectText2": "Not empty",
+    "SelectsEnumSelectText3": "Using enum integer values ​​as Items",
     "SelectsNullableTitle": "The binding can be an empty type",
     "SelectsNullableIntro": "<code>an example of the Select</code> component binding <code>int?</code> type",
     "SelectsNullableDescription": "When the first option is selected, the binding value <code>SelectIntItem</code> to <code>null</code>",

src/BootstrapBlazor.Server/Locales/zh-CN.json

@@ -3146,6 +3146,7 @@
     "SelectsEnumDescription2": "绑定值为枚举类型时，设置 <code>PalceHolder</code> 无效",
     "SelectsEnumSelectText1": "可为空",
     "SelectsEnumSelectText2": "不为空",
+    "SelectsEnumSelectText3": "使用枚举整形值作为集合",
     "SelectsNullableTitle": "绑定可为空类型",
     "SelectsNullableIntro": "<code>Select</code> 组件绑定 <code>int?</code> 类型示例",
     "SelectsNullableDescription": "选中第一个选项时，绑定值 <code>SelectedIntItem</code> 为 <code>null</code>",