Make the beneficiary guide more multisig-friendly

beneficiary-guide.md

@@ -1,16 +1,14 @@
 # IrrevocableVesting beneficiary guide
 
 You will be vested tokens through a IrrevocableVesting contract dedicated to you.
-To act on your vesting, you need to interact with your IrrevocableVesting contract using your `beneficiary` account (i.e., the wallet whose address you have provided for the tokens to be vested for).
+To act on your vesting, you need to interact with your IrrevocableVesting contract using your `beneficiary` account (i.e., the account whose address you have provided).
 
 ## ⚠️ WARNING ⚠️
 
 - You will need to send transactions to your IrrevocableVesting contract through your `beneficiary` account.
-  This means you have to be able to connect the respective wallet to Metamask.
   For this reason, `beneficiary` must not belong to a custodial wallet, e.g. it cannot be a crypto exchange deposit address.
 
-- You are recommended to use a hardware wallet to send transactions from your `beneficiary` account.
-  One that can connect to Metamask will do.
+- You are recommended to use a hardware wallet or a [Safe](https://safe.global/) multisig as the `beneficiary` account.
 
 - Whenever you are sending transactions to your IrrevocableVesting contract, verify on the interface of your wallet (or hardware wallet if you are using one) that the address to which the transaction is being sent matches your IrrevocableVesting contract address