doc: remove For ... comments

We don't add or maintain these, and they are of little value, as
well as having the effect of polluting diffs.

They are also wrong, i.e DEFAULT_SCRIPTCHECK_THREADS is not in
validation.h.

src/interfaces/mining.h

@@ -1,22 +1,22 @@
-// Copyright (c) 2024 The Bitcoin Core developers
+// 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.
 
 #ifndef BITCOIN_INTERFACES_MINING_H
 #define BITCOIN_INTERFACES_MINING_H
 
-#include <consensus/amount.h>       // for CAmount
-#include <interfaces/types.h>       // for BlockRef
-#include <node/types.h>             // for BlockCreateOptions, BlockWaitOptions
-#include <primitives/block.h>       // for CBlock, CBlockHeader
-#include <primitives/transaction.h> // for CTransactionRef
-#include <stdint.h>                 // for int64_t
-#include <uint256.h>                // for uint256
-#include <util/time.h>              // for MillisecondsDouble
+#include <consensus/amount.h>
+#include <interfaces/types.h>
+#include <node/types.h>
+#include <primitives/block.h>
+#include <primitives/transaction.h>
+#include <uint256.h>
+#include <util/time.h>
 
-#include <memory>   // for unique_ptr, shared_ptr
-#include <optional> // for optional
-#include <vector>   // for vector
+#include <cstdint>
+#include <memory>
+#include <optional>
+#include <vector>
 
 namespace node {
 struct NodeContext;