Update cmd/wrapcontract/usage.md

Co-authored-by: Léo Vincent <[email protected]>

cmd/wrapcontract/usage.md

@@ -1,4 +1,4 @@
-This command takes the bytecode that we want to be deployed for a new contract, and wraps its into the bytecode that we can use to create the contract.
+This command takes the runtime bytecode, the bytecode deployed on-chain, as input and converts it into creation bytecode, the bytecode used to create the contract
 
 ```bash
 $ polycli wrap-contract 69602a60005260206000f3600052600a6016f3