doc: fix invalid arg name hints for bugprone validation

The extra leading `=` or missing trailing `=` prevented clang-tidy's `bugprone-argument-comment` check from validating the parameter name, as it only matches comments formatted strictly as `/*arg=*/` (see https://clang.llvm.org/extra/clang-tidy/checks/bugprone/argument-comment.html).

src/wallet/test/coinselection_tests.cpp

@@ -24,7 +24,7 @@ static const int P2WPKH_OUTPUT_VSIZE = 31;
 static CoinSelectionParams init_default_params()
 {
     CoinSelectionParams dcsp{
-        /*rng_fast*/default_rand,
+        /*rng_fast=*/default_rand,
         /*change_output_size=*/P2WPKH_OUTPUT_VSIZE,
         /*change_spend_size=*/P2WPKH_INPUT_VSIZE,
         /*min_change_target=*/50'000,

src/wallet/test/coinselector_tests.cpp

@@ -277,14 +277,14 @@ BOOST_AUTO_TEST_CASE(bnb_search_test)
         add_coin(available_coins, *wallet, 1 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
 
         CAmount selection_target = 16 * CENT;
-        const auto& no_res = SelectCoinsBnB(GroupCoins(available_coins.All(), /*subtract_fee_outputs*/true),
+        const auto& no_res = SelectCoinsBnB(GroupCoins(available_coins.All(), /*subtract_fee_outputs=*/true),
                                             selection_target, /*cost_of_change=*/0, MAX_STANDARD_TX_WEIGHT);
         BOOST_REQUIRE(!no_res);
         BOOST_CHECK(util::ErrorString(no_res).original.find("The inputs size exceeds the maximum weight") != std::string::npos);
 
         // Now add same coin value with a good size and check that it gets selected
         add_coin(available_coins, *wallet, 5 * CENT, coin_selection_params_bnb.m_effective_feerate, 6 * 24, false, 0, true);
-        const auto& res = SelectCoinsBnB(GroupCoins(available_coins.All(), /*subtract_fee_outputs*/true), selection_target, /*cost_of_change=*/0);
+        const auto& res = SelectCoinsBnB(GroupCoins(available_coins.All(), /*subtract_fee_outputs=*/true), selection_target, /*cost_of_change=*/0);
 
         expected_result.Clear();
         add_coin(8 * CENT, 2, expected_result);

src/wallet/test/wallet_tests.cpp

@@ -332,7 +332,7 @@ BOOST_FIXTURE_TEST_CASE(LoadReceiveRequests, TestingSetup)
             auto requests = wallet->GetAddressReceiveRequests();
             auto erequests = {"val_rr11", "val_rr20"};
             BOOST_CHECK_EQUAL_COLLECTIONS(requests.begin(), requests.end(), std::begin(erequests), std::end(erequests));
-            RunWithinTxn(wallet->GetDatabase(), /*process_desc*/"test", [](WalletBatch& batch){
+            RunWithinTxn(wallet->GetDatabase(), /*process_desc=*/"test", [](WalletBatch& batch){
                 BOOST_CHECK(batch.WriteAddressPreviouslySpent(PKHash(), false));
                 BOOST_CHECK(batch.EraseAddressData(ScriptHash()));
                 return true;