A few more tweaks to outline the steps

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.3+
| Fixed tickets | n/a

Hey guys!

This is just a tweak to #4591 - it's just a minor organizational thing so that (hopefully) it's even more clear what 3 steps you need to take.

Thanks!
I don't believe this works, as it's now looking for a file named `3) Push your Code to Heroku`. You have to add reference anchors above these headlines and use that.