Update arbitrum-docs/launch-orbit-chain/02-configure-your-chain/common-configurations/02-customizable-challenge-period.mdx

Co-authored-by: José FP <105675159+TucksonDev@users.noreply.github.com>

Author: pete-vielhaber

arbitrum-docs/launch-orbit-chain/02-configure-your-chain/common-configurations/02-customizable-challenge-period.mdx

@@ -64,7 +64,7 @@ Replace:
 
 For Orbit chains aligned with Arbitrum One's configuration, the recommended settings are:
 
-- **Challenge period blocks**: 45,818 parent chain blocks (approximately one week).
+- **Challenge period blocks**: 45,818 Ethereum blocks (approximately one week).
 - **Extra challenge period blocks**: 200 Ethereum blocks (approximately 40 minutes).
 
 These values offer a robust and balanced setup for most rollup use cases. Developers should consider their application’s requirements when adjusting these parameters: