* Fix the page title in Isotonic regression documents (Naive Bayes -> Isotonic regression)
* Add a newline character at the end of the file

Author: dobashim <dobashim@oss.nttdata.co.jp>

Closes #5581 from dobashim/master and squashes the following commits:

d54a041 [dobashim] Fix typo of the page title in Isotonic regression documents