Correct documentation regarding FTE encryption

Author: losipiuk

docs/src/main/sphinx/admin/fault-tolerant-execution.md

@@ -153,7 +153,7 @@ cluster that handles short queries.
 Trino encrypts data before spooling it to storage. This prevents access to query
 data by anyone besides the Trino cluster that wrote it, including administrators
 of the storage system. A new encryption key is randomly generated for every
-exchange with every query, and keys are discarded once a query is completed.
+query, and the key is discarded once a query is completed.
 
 ## Advanced configuration