Merge bitcoin/bitcoin#31331: doc: add copyright header to p2p_headers_presync

7d3703d doc: add copyright header to p2p_headers_presync (fanquake)

Pull request description:

  Add the missing copyright header.

ACKs for top commit:
  willcl-ark:
    ACK 7d3703d

Tree-SHA512: c1be62ac9ebb6ef0210670e80aa473da287b26c4f29e347a4f837652ed4c2bb71f952c83f14fc13f1b523f8712d79d78bda5dcdf5fd6fc61788c1d86a67a4729

Author: fanquake

src/test/fuzz/p2p_headers_presync.cpp

@@ -1,3 +1,7 @@
+// Copyright (c) 2024-present The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
 #include <arith_uint256.h>
 #include <blockencodings.h>
 #include <net.h>