Fix CustomWorkspace example to use new API. Refs #7344

The example used to old API and therefore did not work out of the box.

Code/Mantid/Framework/Algorithms/src/CreateWorkspace.cpp

 /*WIKI* 
 
 
-Example of use in Python for create a simple histogram workspace, automatically populating the VerticalAxis with SpectraNumber values.
+Example of use in Python for create a simple histogram workspace and automatically populating the VerticalAxis with SpectraNumber values.
 
 <div style="border:1pt dashed black; background:#f9f9f9;padding: 1em 0;">
 <source lang="python">
@@ -9,7 +9,8 @@ Example of use in Python for create a simple histogram workspace, automatically
  dataY = [1,2,3,4,5,6,7,8,9,10,11,12]
  dataE = [1,2,3,4,5,6,7,8,9,10,11,12]
  
- CreateWorkspace('CreateWorkspace', dataX, dataY, dataE, NSpec=4,UnitX="Wavelength")
+ # The workspace will be named "dataWS"
+ dataWS = CreateWorkspace(DataX=dataX, DataY=dataY, DataE=dataE, NSpec=4,UnitX="Wavelength")
 </source></div>