The third ROI coordinate comment is not correct

[Yili Zhao]

In "roi_pooling_minimal_example.ipynb":

# * channel 0, rectangular region (1, 0) to (3, 2)
#              ....
#              xxx.
#              xxx.
#              xxx.

I think this comment should be:

# * channel 0, rectangular region (1, 0) to (3, 2)
#              .xxx
#              .xxx
#              .xxx
#              ....

[Tomasz Grel]

@stared any opinions on that?

[Piotr Migdał]

@tgrel Sure!
@panovr You are right, thank you for bringing this issue. I created a PR fixing this problem.

[Yili Zhao]

@tgrel @stared Thanks!