Don't treat Flow inexact tuples as empty (#18616)

changelog_unreleased/flow/18616.md

@@ -0,0 +1,23 @@
+#### Improve comment format in inexact tuples (#18616 by @fisker)
+
+<!-- prettier-ignore -->
+```jsx
+// Input
+type A = [// comment
+...];
+type B = [/* comment */...];
+
+// Prettier stable
+type A = [...
+  // comment
+];
+type B = [...
+  /* comment */
+];
+
+// Prettier main
+type A = [
+  ...// comment
+];
+type B = [.../* comment */];
+```