Doc: add row for Qt 5.0 datastream version

We seem to have two tables. That's a bad idea, but they are there.

I won't add Qt 5.1 until we're certain that the datastream isn't
changing. It's preferable to lack information than to show the wrong
value.

Change-Id: Ibc7eb95bbbf3b35388f910154372fdd896735430
Reviewed-by: Martin Smith <martin.smith@digia.com>

src/corelib/io/qdatastream.cpp

@@ -571,6 +571,7 @@ void QDataStream::setByteOrder(ByteOrder bo)
 
     \table
     \header \li Qt Version       \li QDataStream Version
+    \row \li Qt 5.0                  \li 13
     \row \li Qt 4.6                  \li 12
     \row \li Qt 4.5                  \li 11
     \row \li Qt 4.4                  \li 10