Rollup merge of #25925 - azerupi:patch-4, r=steveklabnik
Rollup merge of #25925 - azerupi:patch-4, r=steveklabnik

Hi

I added a little section in the for loops about the `enumerate()` function.
I think it's useful for beginners to know this function and how you can use it. 

I used the title loopcounter, but it's probably not the best word to describe it. So let me know if there is a better word :)

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