correct import error in tomo module -> sinogram module
@@ -29,10 +29,10 @@ A tomotherapy toolbox.
Available Functions
-------------------
->>> from pymedphys.sinogram import read_sng_csv_file
->>> from pymedphys.sinogram import read_sng_bin_file
->>> from pymedphys.sinogram import crop_sng
->>> from pymedphys.sinogram import unshuffle_sng
+>>> from pymedphys.sinogram import read_csv_file
+>>> from pymedphys.sinogram import read_bin_file
+>>> from pymedphys.sinogram import crop
+>>> from pymedphys.sinogram import unshuffle
>>> from pymedphys.sinogram import make_histogram
>>> from pymedphys.sinogram import find_modulation_factor
"""
