Clarify some docs related to Overwinter, which HUSH and all HSCs have

src/main.cpp

@@ -1758,6 +1758,8 @@ bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransa
     // Node operator can choose to reject tx by number of transparent inputs
     static_assert(std::numeric_limits<size_t>::max() >= std::numeric_limits<int64_t>::max(), "size_t too small");
     size_t limit = (size_t) GetArg("-mempooltxinputlimit", 0);
+
+    // Limit is ignored if Overwinter is active, which is the case on HUSH3 and all HSC's
     if (NetworkUpgradeActive(nextBlockHeight, Params().GetConsensus(), Consensus::UPGRADE_OVERWINTER)) {
         limit = 0;
     }