intro/scipy.rst: fix trailing whitespace
image_processing/image_processing.rst: better scaling of images
intro/scipy.rst intro/image_processing/image_processing.rst : minor fixes
Merge branch 'overhaul/intro/scipy'

* overhaul/intro/scipy:
  intro/scipy.rst intro/image_processing/image_processing.rst : minor fixes
  image_processing/image_processing.rst: better scaling of images
  intro/scipy.rst: fix trailing whitespace