Added stride to iloc documentation
Stride examples were added to iloc documentation.
Thanks for the contribution @bizzyvinci. While I understand that strides on a dataframe may be useful to you, I think it's a rare use-case, and I would prefer not to add extra noise in an already long and complex documentation page. And I don't think it adds much value either, since in the current page we already show that using slices with `iloc` is possible, so I think we don't need to show all possible options of slices, the Python documentation already shows that.

So, -1 on this PR. But I'll wait for a second opinion, and see if other maintainers find this is an improvement. Agreed especially since slices with `iloc` are already demonstrated. Thanks for the contribution @bizzyvinci but going to close this pull request. We would be happy to have other pull requests closing issues with the label `good first issue` Ok. Thanks for the feedback.