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

@@ -79,7 +79,7 @@ Parent chain: Ethereum mainnet
 | ERC721Predicate       | [0x54150f44c785d412ec262fe895cc3b689c72f49b](https://etherscan.io/address/0x54150f44c785d412ec262fe895cc3b689c72f49b) |
 
 
-**Child Chain: Polygon Mainnet**
+**Child chain: Polygon mainnet**
 
 | Contracts             | Address                                    |
 |-----------------------|--------------------------------------------|