Fix some broken links in "Coding a workflow" section

[tom-pratt]

No description provided.

[CLAassistant]

All committers have signed the CLA.

[rjrjr]

Oops, I'm sorry, I lost track of this.

@steve-the-edwards, @RBusarow, would a quick rebase fix the broken mkdocs shard?

[tom-pratt]

Not sure if I'm just not seeing it but i can't find the rebase button in github. I can do it locally though if you think that will do the trick.

[steve-the-edwards]

Not sure if I'm just not seeing it but i can't find the rebase button in github. I can do it locally though if you think that will do the trick.

Ya it looks like we don't have auto-rebase set up on this repo. If you do it locally that's great.

[steve-the-edwards]

Not sure if I'm just not seeing it but i can't find the rebase button in github. I can do it locally though if you think that will do the trick.

Ya it looks like we don't have auto-rebase set up on this repo. If you do it locally that's great.

Actually @tom-pratt I just realized this fix wasn't made int he validate workflow. We needed to update the python version. I did it here #1264 so you'll have to rebase after that is merged.

[tom-pratt]

Rebased, hopefully these updated links still make sense!