Update pages/builders/notices/holocene-changes.mdx

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: wentelteefje

pages/builders/notices/holocene-changes.mdx

@@ -18,9 +18,12 @@ If you experience difficulty at any stage of this process, please reach out to [
 
   The Holocene upgrade for the Soneium Minato (Sepolia) will be activated at **Fri Dec 20 at 09:00:00 UTC** (`1734685200`).
 
-  The Holocene upgrade for the Soneium Mainnet will be activated at **Mon Feb 03 at 09:00:00 UTC** (`1738573200`).
+  The Holocene upgrade for the Soneium Minato (Sepolia) will be activated at **Fri Dec 20 at 09:00:00 UTC** (`1734685200`).
 
   The Holocene upgrade for the Mainnet Superchain is scheduled for **Thu 9 Jan 2025 18:00:01 UTC**, [governance approval](https://vote.optimism.io/proposals/20127877429053636874064552098716749508236019236440427814457915785398876262515).
+
+  The Holocene upgrade for the Soneium Mainnet will be activated at **Mon Feb 03 at 09:00:00 UTC** (`1738573200`).
+  The Holocene upgrade for the Mainnet Superchain is scheduled for **Thu 9 Jan 2025 18:00:01 UTC**, [governance approval](https://vote.optimism.io/proposals/20127877429053636874064552098716749508236019236440427814457915785398876262515).
 </Callout>
 
 ## What's included in Holocene