Fix AtomicBool linksub to use core path instead of std

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: brson

src/linksubs.json5

@@ -105,7 +105,7 @@
     "crate::std::sync":
     "api/std/sync/index.html",
     "std::sync::atomic::AtomicBool":
-    "api/std/sync/atomic/struct.AtomicBool.html",
+    "api/core/sync/atomic/struct.AtomicBool.html",
     "crate::std::thread":
     "api/std/thread/index.html",
     "crate::std::sync::mpsc":