Clang-doc: markdown generator type naming

[BotellaA]

Is there a reason to output the Reference::Name instead of Reference::QualName?

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

Lines 166 to 167 in 08136d8

	writeLine(genItalic(Access + " " + I.ReturnType.Type.Name + " " + I.Name +
	"(" + Stream.str() + ")"),

The generated doc is not clear without the template information.
For example, returning a tuple only displays "tuple" without its content types.

[ilovepi]

@PeterChou1 This seems like an easy fix, and fits in nicely with your GSOC project. Would you mind taking a look at this? If possible, pre-commit a test for the existing behavior if it doesn't exist, and then making another PR for the fix and updated tests. You can add @petrhosek and @ilovepi as reviewers, in addition to @BotellaA.