make_checkpoint: rewrite code for every100th iterations

[skshetry]

IANADS so any help on improving this code/docs would be great.

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[dberenbaum]

My overall take here: I don't have a strong opinion on whether to merge this. It's a more realistic example, but the original example was simplistic on purpose to clarify how it works.

IMO it would be better to focus on improving checkpoints functionality before worrying too much about improving the docs. See https://github.com/iterative/dvc/issues/7381.

[skshetry]

but the original example was simplistic on purpose to clarify how it works.

I disagree that it was simplistic because of all the reading/writing stuff it is doing, which is confusing. Also, it's 22 lines of code.