Fix typo in QSqlTableModel documentation

Change-Id: I4e9ab7469b028464186d3067759a2cf6fb187b07
Reviewed-by: Mark Brand <mabrand@mabrand.nl>

src/sql/models/qsqltablemodel.cpp

@@ -494,7 +494,7 @@ QVariant QSqlTableModel::headerData(int section, Qt::Orientation orientation, in
     \since 5.0
 
     Returns \c true if the model contains modified values that have not been
-    committed to the datase, otherwise false.
+    committed to the database, otherwise false.
 */
 bool QSqlTableModel::isDirty() const
 {