967341: Add code fix for CI error

Author: NiranjanAnumuthu21

ej2-asp-core-mvc/document-editor/how-to/customize-ribbon.md

@@ -34,7 +34,8 @@ In below code example, In the example below, the "Open" and "Export" items have
 {% include code-snippet/document-editor-container/customize-ribbon-file/tagHelper %}
 {% endhighlight %}
 {% highlight c# tabtitle="Customize-ribbon-file.cs" %}
-{% endhighlight %}{% endtabs %}
+{% endhighlight %}
+{% endtabs %}
 
 {% elsif page.publishingplatform == "aspnet-mvc" %}
 
@@ -43,7 +44,9 @@ In below code example, In the example below, the "Open" and "Export" items have
 {% include code-snippet/document-editor-container/customize-ribbon-file/razor %}
 {% endhighlight %}
 {% highlight c# tabtitle="Customize-ribbon-file.cs" %}
-{% endhighlight %}{% endtabs %}
+{% endhighlight %}
+{% endtabs %}
+
 {% endif %}
 
 ## Backstage Menu Customization
@@ -59,7 +62,8 @@ The following code example shows how to add the backstage menu items.
 {% include code-snippet/document-editor-container/customize-ribbon-backstage/tagHelper %}
 {% endhighlight %}
 {% highlight c# tabtitle="Customize-ribbon-backstage.cs" %}
-{% endhighlight %}{% endtabs %}
+{% endhighlight %}
+{% endtabs %}
 
 {% elsif page.publishingplatform == "aspnet-mvc" %}
 
@@ -69,7 +73,9 @@ The following code example shows how to add the backstage menu items.
 {% endhighlight %}
 {% highlight c# tabtitle="Customize-ribbon-backstage.cs" %}
 {% endhighlight %}
-{% endtabs %}{% endif %}
+{% endtabs %}
+
+{% endif %}
 
 Refer this documentation know more about [`backstage items`](https://ej2.syncfusion.com/documentation/ribbon/backstage)