fix(demo): broken link

Author: dynamsoft-h

samples/demo/index.html

@@ -48,7 +48,7 @@
 
         <div class="start-mwc-btn">Get Started</div>
         <div class="learn-more-btns">
-          <a href="https://www.dynamsoft.com/mobile-document-scanner/docs/web/code-gallery/mobile-web-capture.html" target="_blank">
+          <a href="https://www.dynamsoft.com/mobile-document-scanner/docs/web/code-gallery/mobile-web-capture/index.html" target="_blank">
             <span style="border-bottom: 1.5px solid black">
               View Dev Guide
               <svg