[Doc] props title

packages/dialog/en-US.md

@@ -131,7 +131,7 @@ export default {
 | beforeClose | Callback before close,<br>call done() to close dialog,<br>call done(false) to cancel loading | (action: string, done: function) => void | - |
 | getContainer | Return the mount node for Dialog | `String | () => HTMLElement` | `body` |
 
-### API
+### Props
 
 | Attribute | Description | Type | Default |
 |------|------|------|------|
@@ -151,7 +151,7 @@ export default {
 | before-close | Callback before close,<br>call done() to close dialog,<br>call done(false) to cancel loading | (action: string, done: function) => void | - |
 | get-container | Return the mount node for Dialog | `String | () => HTMLElement` | `body` |
 
-### Event
+### Events
 
 | Event | Description | Parameters |
 |------|------|------|