Allow qualname in literals

Qualnames should be usable in literals as well. E.g.,
a concrete Enum type.

Author: lagru

src/docstub/doctype.lark

@@ -59,7 +59,7 @@ literals : "{" literal ("," literal)* "}"
 literal : PY_ELLIPSES
         | STRING
         | NUMBER
-        | NAME
+        | qualname
 
 PY_ELLIPSES : "..."
 

tests/test_docstrings.py

@@ -63,6 +63,7 @@ def test_container(self, doctype, expected):
         [
             ("{'a', 1, None, False}", "Literal['a', 1, None, False]"),
             ("dict[{'a', 'b'}, int]", "dict[Literal['a', 'b'], int]"),
+            ("{SomeEnum.FIRST}", "Literal[SomeEnum_FIRST]"),
         ],
     )
     def test_literals(self, doctype, expected):