Update setup.cfg

Author: muhammadumargroupdocs

packages/markitdown/src/setup.cfg

@@ -4,7 +4,7 @@ version = 25.3.1
 author = Openize
 author_email = packages@openize.com
 description = A document converter for Word, PDF, Excel, and PowerPoint to Markdown.
-long_description = file:/README.md  
+long_description = file:README.md  
 long_description_content_type = text/markdown
 license = MIT
 license_files = LICENSE