[clang-doc] Use QualName in Markdown output

QualName will provide the more useful typename when the type is
templated.

Fixes #67549

Reviewers: petrhosek, PeterChou1

Reviewed By: petrhosek

Pull Request: #119815

Author: ilovepi

clang-tools-extra/clang-doc/MDGenerator.cpp

@@ -157,17 +157,17 @@ static void genMarkdown(const ClangDocContext &CDCtx, const FunctionInfo &I,
   for (const auto &N : I.Params) {
     if (!First)
       Stream << ", ";
-    Stream << N.Type.Name + " " + N.Name;
+    Stream << N.Type.QualName + " " + N.Name;
     First = false;
   }
   writeHeader(I.Name, 3, OS);
   std::string Access = getAccessSpelling(I.Access).str();
   if (Access != "")
-    writeLine(genItalic(Access + " " + I.ReturnType.Type.Name + " " + I.Name +
-                        "(" + Stream.str() + ")"),
+    writeLine(genItalic(Access + " " + I.ReturnType.Type.QualName + " " +
+                        I.Name + "(" + Stream.str() + ")"),
               OS);
   else
-    writeLine(genItalic(I.ReturnType.Type.Name + " " + I.Name + "(" +
+    writeLine(genItalic(I.ReturnType.Type.QualName + " " + I.Name + "(" +
                         Stream.str() + ")"),
               OS);
   if (I.DefLoc)

clang-tools-extra/test/clang-doc/templates.cpp

@@ -150,7 +150,7 @@ tuple<int,int,bool> func_with_tuple_param(tuple<int,int,bool> t){ return t;}
 // YAML-NEXT: ...
 
 // MD: ### func_with_tuple_param
-// MD: *tuple func_with_tuple_param(tuple t)*
+// MD: *tuple<int, int, _Bool> func_with_tuple_param(tuple<int, int, _Bool> t)*
 // MD: *Defined at {{.*}}templates.cpp#[[# @LINE - 44]]*
 // MD:  A function with a tuple parameter
 // MD: **t** The input to func_with_tuple_param