STYLE: Fix formatting/punctuation errors.

ScalarImageKmeansClassifier examples fixes:

It should use non-contiguous labels for the output to be displayed
in the ITKSoftwareGuide, and correct method/argument names.

Change-Id: I17853b85a6aa0872bd699c7a6c2824f6f992cfaf
Merge topic '4.7-book-fixes'

f6026394 STYLE: Fix formatting/punctuation errors.
ENH: Direct initialization of SyN by restoring the state

Set FixedToMiddle and MovingToMiddle transforms from a saved state to
intialize the registration.

Change-Id: Iab819bab15e63c6c9dac0c770c76fbeec53e5075