Fixing a typo in PersistEvent.cs (#3570)

Co-authored-by: tohidemyname <tohidemyname>

Author: tohidemyname

src/NHibernate/Event/PersistEvent.cs

@@ -13,7 +13,7 @@ public PersistEvent(object entity, IEventSource source)
 		{
 			if (entity == null)
 			{
-				throw new ArgumentNullException("entity", "Attempt to create create event with null entity");
+				throw new ArgumentNullException("entity", "Attempt to create event with null entity");
 			}
 			this.entity = entity;
 		}
@@ -36,4 +36,4 @@ public object Entity
 			set { entity = value; }
 		}
 	}
-}
+}