message: contracts/exchange/exchange.hpp: fix typo
diff: @@ -12,7 +12,7 @@ namespace eosio {
  * an equal value of both sides of the order book and giving the issuer
  * the initial shares in that orderbook.
  *
  - * To prevent exessive rounding errors, the initial deposit should include
  + * To prevent excessive rounding errors, the initial deposit should include
  * a sizeable quantity of both the base and quote currencies and the exchange
  * shares should have a quantity 100x the quantity of the largest initial
  * deposit.
  