fix: progress demo and trailWidth

components/progress/demo/format.md

@@ -18,8 +18,8 @@ import { Progress } from 'antd';
 
 ReactDOM.render(
   <div>
-    <Progress type="circle" percent={75} format={percent => `${percent}% Discount`} />
-    <Progress type="circle" percent={100} format={() => 'Complete'} />
+    <Progress type="circle" percent={75} format={percent => `${percent} Days`} />
+    <Progress type="circle" percent={100} format={() => 'Done'} />
   </div>
 , mountNode);
 ````

components/progress/progress.tsx

@@ -92,9 +92,10 @@ export default class Progress extends React.Component<ProgressProps, any> {
         height: circleSize,
         fontSize: circleSize * 0.16 + 6,
       };
+      const circleWidth = strokeWidth || 6;
       progress = (
         <div className={`${prefixCls}-inner`} style={circleStyle}>
-          <Circle percent={percent} strokeWidth={strokeWidth || 6}
+          <Circle percent={percent} strokeWidth={circleWidth} trailWidth={circleWidth}
             strokeColor={statusColorMap[progressStatus]} trailColor={trailColor}
           />
           {progressInfo}