fix get value in docs

documentation/sphinx_static/overview.rst

@@ -210,8 +210,8 @@ the following:
                                                    c.statistics['tauK']))
     data_file = c.get_data_file()
     print ('total time simulated is = {0:.4e} Tint, {1:.4e} tauK'.format(
-            data_file['iteration'].value*c.parameters['dt'] / c.statistics['Tint'],
-            data_file['iteration'].value*c.parameters['dt'] / c.statistics['tauK']))
+            data_file['iteration'][()] * c.parameters['dt'] / c.statistics['Tint'],
+            data_file['iteration'][()] * c.parameters['dt'] / c.statistics['tauK']))
 
 :func:`compute_statistics <TurTLE.DNS.DNS.compute_statistics>`
 will read the data