chore: update flashblocks block building changelog (#96)

Author: danyalprout

docs/base-chain/network-information/block-building.mdx

@@ -13,7 +13,7 @@ The Base networks are currently configured in the following ways:
 
 | Network      | Current Configuration       | Upcoming Deployments                      |
 |--------------|-----------------------------|-------------------------------------------|
-| Base Mainnet | [Vanilla](#vanilla)         | [Flashblocks](#flashblocks) (Summer 2025) |
+| Base Mainnet | [Flashblocks](#flashblocks) | [Flashblocks](#flashblocks) (Summer 2025) |
 | Base Sepolia | [Flashblocks](#flashblocks) | None                                      |
 
 ## Configurations
@@ -45,6 +45,7 @@ priority fee, see the ([code](https://github.com/ethereum-optimism/op-geth/blob/
 
 ## Changelog
 
+* 7th July: Enabled Flashblocks on Base Mainnet
 * 15th May: Ended testing Flashblocks on Base Mainnet
 * 15th May: Started testing Flashblocks on Base Mainnet
 * 25th Feb: Enabled Flashblocks on Base Sepolia