Fix closing bracket on README

Author: m-Peter

README.md

@@ -199,7 +199,7 @@ To use the `make` target to connect a container-based gateway instance to testne
 * `FLOW_NETWORK_ID`: flow-testnet
 * `COINBASE`: FACF71692421039876a5BB4F10EF7A439D8ef61E
 * `COA_ADDRESS`: <16-character hexadecimal address>
-* `COA_KEY`: <64-character hexadecimal private key
+* `COA_KEY`: <64-character hexadecimal private key>
 * `VERSION`: [_repo commit hash or tag version used when building with docker_]
 
 Once set, this target starts the EVM Gateway for the specified image version and connects it to testnet
@@ -222,7 +222,7 @@ Below is an example configuration for running against mainnet, with a preconfigu
 --ws-enabled=true \
 --coinbase=FACF71692421039876a5BB4F10EF7A439D8ef61E \
 --coa-address=<16-character hexadecimal address> \
---coa-key=<64-character hexadecimal private key \
+--coa-key=<64-character hexadecimal private key> \
 --gas-price=100000000
 ```