docs: update overview (#2044)

Author: liweijie0812

site/docs/overview.en-US.md

@@ -240,7 +240,7 @@ spline: explain
   </div>
 </section>
 
-<h3>Data Display<em class="tag">19</em></h3>
+<h3>Data Display<em class="tag">20</em></h3>
 <section class="image-group">
   <div class="image-wrapper">
     <a class="item" href="./components/avatar-en">
@@ -375,6 +375,13 @@ spline: explain
       <p class="name">Tag</p>
     </a>
   </div>
+  <div class="image-wrapper">
+      <a class="item" href="./components/watermark">
+        <img class="__light__" src="https://tdesign.gtimg.com/site/mobile/doc-watermark.png" />
+        <img class="__dark__" src="https://tdesign.gtimg.com/site/mobile/doc-watermark-dark.png" />
+        <p class="name">Watermark</p>
+      </a>
+    </div>
 </section>
 
 <h3>Feedback<em class="tag">13</em></h3>