feat: 重命名配置项参数 "Endpoints" → "Endpoint"

src/SKIT.FlurlHttpClient.Wechat.TenpayV2/Extensions/WechatTenpayClientExecuteFraudExtensions.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
@@ -11,6 +11,7 @@ namespace SKIT.FlurlHttpClient.Wechat.TenpayV2
         /// <summary>
         /// <para>异步调用 [POST] /risk/getpublickey 接口。</para>
         /// <para>REF: https://pay.weixin.qq.com/wiki/doc/api/tools/mch_pay_yhk.php?chapter=24_7&index=4 </para>
+        /// <para><i>（请注意此接口不受构造 <see cref="WechatTenpayClient" /> 时指定的 <see cref="WechatTenpayClientOptions.Endpoint"/> 参数控制。）</i></para>
         /// </summary>
         /// <param name="client"></param>
         /// <param name="request"></param>