note that checkout instructions can be completed in any order

[brownsarahm]

          I have a suggestion for how to improve the checkout instructions:

I think it should be made explicit that the three checkout steps can be completed in any order.
Currently the steps are written out as a numbered list (1., 2., 3.), and to me at least, this implies that they should be completed in that specified order.

https://carpentries.github.io/instructor-training/checkout.html#getinvolved

Originally posted by @sjw46 in #1652 (comment)

[brownsarahm]

as much as I do not like replicating I think we should put this note on both the episode and the instruction page