Fix the publishing failures issues related to "PDF-Viewer" component.

Author: Hemaprasanth-Hari

Document-Processing/PDF/PDF-Viewer/react/getting-started-with-server-backed.md

@@ -174,10 +174,10 @@ Output will be appears as follows.
 
 {% tabs %}
 {% highlight js tabtitle="app.jsx" %}
-{% include code-snippet/pdfviewer/react/base-cs1/app/app.jsx %}
+{% include code-snippet/pdfviewer/react/base-cs1/app/index.jsx %}
 {% endhighlight %}
 {% highlight ts tabtitle="app.tsx" %}
-{% include code-snippet/pdfviewer/react/base-cs1/app/app.tsx %}
+{% include code-snippet/pdfviewer/react/base-cs1/app/index.tsx %}
 {% endhighlight %}
 {% highlight html tabtitle="index.html" %}
 {% include code-snippet/pdfviewer/react/base-cs1/index.html %}