update replace option example (vuejs#293)

yanxyz · yyx990803 · commit 5e4061b5a885 · 2016-04-29T21:48:59.000-04:00
diff --git a/src/api/index.md b/src/api/index.md
@@ -592,7 +592,7 @@ type: api
   Will result in:
 
   ``` html
-  <p class="foo bar">replaced</p>
+  <p class="foo bar" id="replace">replaced</p>
   ```
 
   In comparison, when `replace` is set to `false`:
