Update docs/pos/reference/contracts/genesis-contracts.md

Co-authored-by: kmurphypolygon <149679879+kmurphypolygon@users.noreply.github.com>

Author: EmpieichO

docs/pos/reference/contracts/genesis-contracts.md

@@ -46,7 +46,7 @@ Parent Chain: Goerli
 
 <TabItem value="mainnet">
 
-Parent Chain: Ethereum Mainnet
+Parent chain: Ethereum mainnet
 
 | Contracts             | [Address](https://etherscan.io/address/Address)                                                                       |
 |-----------------------|-----------------------------------------------------------------------------------------------------------------------|