Add failing test for overload tag completions.

tests/cases/fourslash/jsdocOverloadTagCompletion1.ts

@@ -0,0 +1,15 @@
+///<reference path="fourslash.ts" />
+
+// @noEmit: true
+// @allowJS: true
+// @checkJs: true
+
+// @filename: /a.js
+/////**
+//// * @/**/
+//// */
+////const t = { a: 1 };
+
+verify.completions(
+    { marker: "", includes: ["overload"] },
+);