Augment Documentation

Task-number: QTBUG-18235

doc/src/declarative/globalobject.qdoc

@@ -128,6 +128,8 @@ These databases are user-specific and QML-specific, but accessible to all QML ap
 They are stored in the \c Databases subdirectory
 of QDeclarativeEngine::offlineStoragePath(), currently as SQLite databases.
 
+Database connections are automatically closed during Javascript garbage collection.
+
 The API can be used from JavaScript functions in your QML:
 
 \snippet declarative/sqllocalstorage/hello.qml 0