Backport PR #901: remove use of deprecated sunpy api in example gallery (#902)

Co-authored-by: Stuart Mumford <[email protected]>

Author: meeseeksmachine

examples/creating_even_spaced_wavelength_visualisation.py

@@ -53,7 +53,7 @@
 # This is due to the convention that WCS axis ordering is reversed
 # compared to data array axis ordering.
 
-my_cube = NDCube(sequence_of_maps.as_array(), wcs=cube_wcs)
+my_cube = NDCube(data=sequence_of_maps.data, mask=sequence_of_maps.mask, wcs=cube_wcs)
 # Produce an interactive plot of the spectral-image stack.
 my_cube.plot(plot_axes=['y', 'x', None])