Remove typos & spurious spaces in the class description.

The prefix spaces generate bad looking (code citing mode)
doxygen description.
http://www.vtk.org/doc/nightly/html/classvtkOctreePointLocator.html#details

Change-Id: I2e11aad40ec178b54100a96ffeeb0fd9b1df9ce6
Merge topic 'Fix_OctreePointLocator_Descr' into master

7b567e57 Remove typos & spurious spaces in the class description.