tiny docs tweak

Author: hpihkala

docs/docs/usage/streams/permissions.md

@@ -6,7 +6,7 @@ sidebar_position: 6
 
 Stream permissioning relates to who gets to read, write and edit streams on the Network. This access control is enforced by the [on-chain stream registry](../../streamr-network/smart-contracts.md). Since every permission update is a modification to the on-chain registry, it requires a small amount of `POL` tokens to fund the transaction.
 
-User's are identified by their Ethereum public key address. It is these addresses that are given permission to read/write/edit streams.
+Users on Streamr have a cryptographic [Identity](../identity.md), specified by a public/private key pair. It is such keys that are given permission to read/write/edit streams.
 
 :::info Good to know: