Update docs/notices/arbos51-arbsepolia-upgrade-notice.mdx

Co-authored-by: Gaël Blanchemain <anegg0@users.noreply.github.com>

Author: zk-Lumi

docs/notices/arbos51-arbsepolia-upgrade-notice.mdx

@@ -18,6 +18,6 @@ Arbitrum Sepolia node operators **must upgrade** to Nitro **`v3.9.3`** ahead of
 
 ### **Context**
 
-[ArbOS 51](docs/run-arbitrum-node/arbos-releases/arbos51.mdx) is a follow-up to ArbOS 50 that fixes issues with the Pricing Framework. ArbOS 50 was previously activated on Sepolia, but the Gas Target & Pricing Framework changes remained disabled pending this fix. ArbOS 51 now completes that work.
+[ArbOS 51](docs/run-arbitrum-node/arbos-releases/arbos51.mdx) is a follow-up to ArbOS 50 that fixes issues with the pricing framework. ArbOS 50 was previously activated on Sepolia, but the Gas Target & Pricing Framework changes remained disabled pending this fix. ArbOS 51 now completes that work.
 
 Upstream governance items ([ArbOS 50](https://snapshot.box/#/s:arbitrumfoundation.eth/proposal/0x33754da4006d0ef38666ec5d5e85fd0966a891a594ab9dc21f23beedea2d330b) + [Gas Target & Pricing Framework](https://snapshot.box/#/s:arbitrumfoundation.eth/proposal/0x4a96a91d162975de0d402b83ca8b8a24e808ca357150120fc0d44ae0bf1cc4a5)) are being bundled into a single on-chain vote. Both components have passed Snapshot temperature checks, with the Tally vote expected to open on or around **December 4, 2025**.