[api] Fix link in the API header

The previous link does not use http, and redirects to
http://developers.google.com/v8/?csw=1, which again redirects to
https://v8.dev/.
Thus place the proper link directly.

R=ulan@chromium.org

No-Try: true
Change-Id: Ifb4fa7cbb5727bab1a2e46ce1801fdef7c70a5ee
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2010797Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65906}

include/v8.h

@@ -9,7 +9,7 @@
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
  *
- * For other documentation see http://code.google.com/apis/v8/
+ * For other documentation see https://v8.dev/.
  */
 
 #ifndef INCLUDE_V8_H_