Update docs/glossary.mdx

Co-authored-by: Nic Young <[email protected]>

Author: barriebyron

docs/glossary.mdx

@@ -234,7 +234,7 @@ An incrementing number attached to a transaction used to prevent a replay of a t
 
 ### off-chain
 
-A transfer of value or data, including transactions, that occurs outside a given blockchain network. Transactions are executed instantly, speeding up the transaction process and reducing lag time.
+A transfer of value or data, including transactions, that occurs outside a given blockchain network. These transfers do not need blockchain network confirmation, which speeds up the transaction process and reduces lag time.
 
 ### on-chain