Add type annotation

Author: TLouf

sphinx/domains/python.py

@@ -225,7 +225,7 @@ def unparse(node: ast.AST) -> List[Node]:
 
 
 def _parse_arglist(
-    arglist: str, env: Optional[BuildEnvironment] = None, multiline=False
+    arglist: str, env: Optional[BuildEnvironment] = None, multiline: bool = False
 ) -> addnodes.desc_parameterlist:
     """Parse a list of arguments using AST parser"""
     params = addnodes.desc_parameterlist()