fix(docs): update fassets cv overview (#916)

Author: dineshpinto

docs/fassets/5-core-vault.mdx

@@ -26,13 +26,13 @@ It addresses a critical challenge in cross-chain systems: **protecting user fund
 
 ### Why the Core Vault?
 
-- In **FAssets v1**, every agent had to keep the underlying asset (e.g., XRP) in their own wallet.
+- In **FAssets v1**, participating agents were required to individually hold sufficient redemption assets (e.g., XRP) in their wallets.
 - To prevent theft, agents needed to be heavily overcollateralized - they had to lock up more value than they could ever profit from stealing.
 - This worked, but it limited minting capacity and made the system capital-inefficient.
 
 The **Core Vault** changes this model:
 
-- Instead of holding XRP in their own wallets, **agents can transfer underlying assets into a shared, insured vault**.
+- Instead of personally holding redemption assets (e.g., XRP), participating agents can now utilize a shared, insured, non-custodial vault.
 - The vault is **multisig-controlled** and governed by Flare, so agents cannot unilaterally take the funds.
 - Because theft is structurally prevented, agents no longer need extreme levels of overcollateralization.