Update L2 timeline (#1563)

See https://forum.celo.org/t/celo-l2-mainnet-announcement/9442.

docs/cel2/index.md

@@ -40,10 +40,10 @@ These dates are subject to change. This documentation will be continuously updat
 #### October 2024: Code Freeze and Audits
 - The core dev team will freeze all feature development by October 14th. All further development will focus on bug fixes and partner support.
 
-#### November or December 2024: Baklava L2 Launch
-- Using the final audited release, the Celo validator community will do a dry run of the L2 upgrade on the Baklava network. Further announcements will confirm the exact date.
+#### 12th December 2024: Baklava L2 Launch
+- Using the final audited release, the Celo validator community will perform a dry run of the L2 upgrade on the Baklava network.
 
-#### December 2024: Celo L2 Mainnet Launch
+#### Mid-January 2025: Celo L2 Mainnet Launch
 - Following a successful Baklava upgrade, the Celo L2 mainnet will officially launch. All nodes must be updated by this time to avoid disruption. Further announcements will confirm the exact date.
 
 ## Useful Links