[chore/marketplace] update coment

contracts/Storage.sol

@@ -92,8 +92,8 @@ contract Storage is Collateral, Marketplace {
       if (balanceOf(host) - slashAmount < minCollateralThreshold) {
         // If host has been slashed enough such that the next slashing would
         // cause the collateral to drop below the minimum threshold, the slot
-        // needs to be freed as the remaining collateral must be used for
-        // repairs and rewards (with any leftover to be burnt).
+        // needs to be freed so that there is enough remaining collateral to be
+        // distributed for repairs and rewards (with any leftover to be burnt).
         _freeSlot(slotId);
       }
       else {