fix(40685): fix generating docs for arrow functions (#40728)

src/services/jsDoc.ts

@@ -329,6 +329,7 @@ namespace ts.JsDoc {
             case SyntaxKind.MethodDeclaration:
             case SyntaxKind.Constructor:
             case SyntaxKind.MethodSignature:
+            case SyntaxKind.ArrowFunction:
                 const { parameters } = commentOwner as FunctionDeclaration | MethodDeclaration | ConstructorDeclaration | MethodSignature;
                 return { commentOwner, parameters };