Limited line length to 80 positions

Removed trailing whitespace

Change-Id: I333b540968f274b607601c22025e147dcc2581ec
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>

doc/src/datastorage.qdoc

@@ -30,15 +30,13 @@
 \title Data Structure and Storage
 \brief Qt's data and storage features
 
-### A brief introduction to the concept of storing data leading into the overview
-of different ways this can be achieved in Qt.
-
 \section1 Container Classes
 
-Qt provides a set of general purpose, template-based container classes that can be used to
-store data in memory. For most purposes, QList will be the best choice, but Qt also provides
-other data structures which might be more appropriate for a given use case due to performance
-characteristics or API. See the full list of \l {container classes} for more details.
+Qt provides a set of general purpose, template-based container classes that
+can be used to store data in memory. For most purposes, QList will be the
+best choice, but Qt also provides other data structures which might be more
+appropriate for a given use case due to performance characteristics or API.
+See the full list of \l {container classes} for more details.
 
 \section1 Saving and Loading Data