Fix: Links with `.md#` are failing

resolves https://github.com/volosoft/volo/issues/3575

modules/docs/src/Volo.Docs.Web/Markdown/MarkdownDocumentToHtmlConverter.cs

@@ -74,6 +74,15 @@ namespace Volo.Docs.Markdown
             return Regex.Replace(content, MarkdownLinkRegExp, delegate (Match match)
             {
                 var link = match.Groups[3].Value;
+
+                var hashPart = "";
+                if (link.Contains("#"))
+                {
+                    var linkSplitted = link.Split("#");
+                    link = linkSplitted[0];
+                    hashPart = linkSplitted[1];
+                }
+
                 if (UrlHelper.IsExternalLink(link))
                 {
                     return match.Value;
@@ -100,6 +109,11 @@ namespace Volo.Docs.Markdown
                     documentLocalDirectoryNormalized = "/" + documentLocalDirectoryNormalized;
                 }
 
+                if (!string.IsNullOrEmpty(hashPart))
+                {
+                    documentName += $"#{hashPart}";
+                }
+
                 return string.Format(
                     MdLinkFormat,
                     displayText,