chore: fix sentence in zksync-sso sessions docs (#323)

# Description

This PR is a small grammatical fix for `sessions` docs in ZKsync-sso.

Co-authored-by: yuliyaalexiev <[email protected]>

Author: bug-author

content/00.zksync-era/30.unique-features/30.zksync-sso/23.sessions.md

@@ -39,7 +39,7 @@ There are four types of customizations available for sessions:
 
 - The length of time the session is valid
 - The amount of ETH that can be spent in transaction fees
-- What types of transfers are allows
+- What types of transfers are allowed
 - What types of contract calls are allowed
 
 The full interface is shown below: