Merge pull request doxygen#10832 from albert-github/feature/bug_md_al…

…ias_space

Warning with ingroup command at end of alias

src/markdown.cpp

@@ -2687,7 +2687,7 @@ void Markdown::Private::writeOneLineHeaderOrRuler(std::string_view data)
 
     if (hasLineBreak(data))
     {
-      out+="<br>";
+      out+="\\ilinebr<br>";
     }
     if (tmpSize != data.size()) out+='\n';
   }