v8: Copyright: Remove extra slashes

Change-Id: I924a2b4dc4ab5e7be22fd2a9a1084473ba65fc35
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3651039Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80711}

test/mjsunit/regress/regress-5174.js

 // Copyright 2016 the V8 project authors. All rights reserved.
-// // Use of this source code is governed by a BSD-style license that can be
-// // found in the LICENSE file.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
 
 assertEquals([], Object.keys(new Proxy([], {})));
 assertEquals([], Object.keys(new Proxy(/regex/, {})));