Fix dangling comment print in function parameters (#18623)

changelog_unreleased/javascript/18623.md

@@ -0,0 +1,27 @@
+#### Fix dangling comment print in function parameters (#18623 by @fisker)
+
+<!-- prettier-ignore -->
+```jsx
+// Input
+fn = function(
+  // comment  
+) {}
+arrow = (
+  // comment  
+) => {}
+
+// Prettier stable
+fn = function () // comment
+{};
+arrow = () =>
+  // comment
+  {};
+
+// Prettier main
+fn = function (
+  // comment
+) {};
+arrow = (
+  // comment
+) => {};
+```