Update build.py

docs/tools/build.py

@@ -332,7 +332,7 @@ def build_redirect_html(args, from_path, to_path):
             from_path.replace('/index.md', '/index.html').replace('.md', '/index.html')
         )
         version_prefix = f'/{args.version_prefix}/' if args.version_prefix else '/'
-        target_path = to_path.replace('.md', '/')
+        target_path = to_path.replace('/index.md', '/').replace('.md', '/')
         to_url = f'/docs{version_prefix}{lang}/{target_path}'
         to_url = to_url.strip()
         write_redirect_html(out_path, to_url)