fix typo

core/src/main/resources/reference.conf

@@ -610,7 +610,7 @@ jdbc-durable-state-store {
       # Slick will use an async executor with a fixed size queue of 10.000 objects
       # The async executor is a connection pool for asynchronous execution of blocking I/O actions.
       # This is used for the asynchronous query execution API on top of blocking back-ends like JDBC.
-      queueSize = 10000 // number of objects that can be queued by the async exector
+      queueSize = 10000 // number of objects that can be queued by the async executor
 
       # This property controls the maximum number of milliseconds that a client (that's you) will wait for a connection
       # from the pool. If this time is exceeded without a connection becoming available, a SQLException will be thrown.