Update README.md

Author: jbern0rd

README.md

@@ -26,9 +26,9 @@ To run properly, the iExec Blockchain Adapter API requires:
 | `IEXEC_BLOCKCHAIN_ADAPTER_API_MONGO_HOST` | Mongo server host. Cannot be set with URI. | String | `localhost` |
 | `IEXEC_BLOCKCHAIN_ADAPTER_API_MONGO_PORT` | Mongo server port. Cannot be set with URI. | Positive integer | `13012` |
 | `IEXEC_BLOCKCHAIN_ADAPTER_API_CHAIN_ID` | Chain ID of the blockchain network to connect. | Positive integer | `134` |
-| `IEXEC_BLOCKCHAIN_ADAPTER_API_IS_SIDECHAIN` | Define if iExec on-chain protocol is built on top of token (`false`) or native currency (`true`). | Boolean | `true` |
+| `IEXEC_BLOCKCHAIN_ADAPTER_API_IS_SIDECHAIN` | Define whether iExec on-chain protocol is built on top of token (`false`) or native currency (`true`). | Boolean | `true` |
 | `IEXEC_BLOCKCHAIN_ADAPTER_API_NODE_ADDRESS` | URL to connect to the blockchain network. | URL | `https://bellecour.iex.ec` |
-| `IEXEC_BLOCKCHAIN_ADAPTER_API_BLOCK_TIME` | In seconds, parameter of the targeted blockchain. | Positive integer | `5` |
+| `IEXEC_BLOCKCHAIN_ADAPTER_API_BLOCK_TIME` | Duration between consecutive blocks on the blockchain network, in seconds. | Positive integer | `5` |
 | `IEXEC_BLOCKCHAIN_ADAPTER_API_HUB_ADDRESS` | Proxy contract address to interact with the iExec on-chain protocol. | Ethereum Address | `0x3eca1B216A7DF1C7689aEb259fFB83ADFB894E7f` |
 | `IEXEC_BLOCKCHAIN_ADAPTER_API_GAS_PRICE_MULTIPLIER` | Transactions will be sent with `networkGasPrice * gasPriceMultiplier`. | Float | `1.0` |
 | `IEXEC_BLOCKCHAIN_ADAPTER_API_GAS_PRICE_CAP` | In Wei, will be used for transactions if `networkGasPrice * gasPriceMultiplier > gasPriceCap`. | Positive integer | `22000000000` |