Fixed Typo in Docs URL

[solrik]

This PR fixes a typo in the Heroku deployment doc.

I noticed a few broken links while reading the doc. I fixed one and added a TODO for the other. It might be good for someone to follow up on that one since I’m not sure what the correct link should be.

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[kennedybaird]

I covered this in #9272 @solrik - didn't realise you had worked on this earlier today

[dcousens]

@kennedybaird if you wanted to add your GitHub pull request review to things (as a LGTM or a reject), we could probably merge things quicker 🚀

[simonswiss]

As mentioned by @kennedybaird — those + others have been covered in I covered this in #9272

Gonna close this one but thank you for your intent to help out 🙏

[dcousens]

Thanks for your first contribution @solrik, your patch is really appreciated despite not being accepted! #9272 simply covered the problem holistically. 💙

[solrik]

Thanks @kennedybaird @simonswiss @dcousens 🙂