chore: sync markdown files from source repo

Author: github-actions[bot]

content/sites/groupdocs/markdown/english/net/_index.md

@@ -12,6 +12,6 @@ version:
 
 | Namespace | Description |
 | --- | --- |
-| [GroupDocs.Markdown](./groupdocs.markdown) |  |
+| [GroupDocs.Markdown](./groupdocs.markdown) | The **GroupDocs.Markdown** namespace provides classes for converting documents to Markdown format and exporting Markdown to other document formats. |
 
 <!-- DO NOT EDIT: generated by xmldocmd for GroupDocs.Markdown.dll -->

content/sites/groupdocs/markdown/english/net/groupdocs.markdown/_index.md

@@ -1,12 +1,12 @@
 ---
 title: GroupDocs.Markdown
 second_title: GroupDocs.Markdown for .NET API Reference
-description: 
+description: The GroupDocs.Markdown namespace provides classes for converting documents to Markdown format and exporting Markdown to other document formats.
 type: docs
 weight: 10
 url: /net/groupdocs.markdown/
 ---
-
+The **GroupDocs.Markdown** namespace provides classes for converting documents to Markdown format and exporting Markdown to other document formats.
 
 ## Classes