update app-payment-alipay.md, app-payment-weixin.md

docs/app-payment-alipay.md

@@ -84,10 +84,10 @@ plus.payment.getChannels(function(channels){
           var rawdata = JSON.parse(result.rawdata);
           console.log("支付成功");
       }, function(e){
-        console.log("支付失败：" + e.message);
+          console.log("支付失败：" + JSON.stringify(e));
     });
   }, function(e){
-    console.log("获取支付渠道失败：" + e.message);
+      console.log("获取支付渠道失败：" + JSON.stringify(e));
 });
 ```
 

docs/app-payment-weixin.md

@@ -111,10 +111,10 @@ plus.payment.getChannels(function(channels){
         var rawdata = JSON.parse(result.rawdata);
         console.log("支付成功");
     }, function(e) {
-         console.log("支付失败：" + e.message);
+        console.log("支付失败：" + JSON.stringify(e));
     });
   }, function(e){
-      console.log("获取支付渠道失败：" + e.message);
+      console.log("获取支付渠道失败：" + JSON.stringify(e));
 });
 ```