Update releasenotes.txt

Author: hazzik

releasenotes.txt

@@ -344,7 +344,7 @@ Build 5.0.0
         * Future queries with data provider not actually supporting them (not supporting mutliple queries in a single
           SQL command) are no more immediately executed at the .Future call. They are executed only when directly
           enumerated or when their IFutureEnumerable.GetEnumerable method is called. (This aligns them with the 
-	  behavior of FutureValue.)
+          behavior of FutureValue.)
         * Dialects are now configurable. If you instantiate a dialect directly, make sure you call its Configure
           method, with as argument the properties of a NHibernate Configuration object. You may use instead
           Dialect.GetDialect methods, which configure the dialect before returning it.