Clarification of Heroku custom domain configuration

[bradly]

Which Cloudflare product does this pertain to?

DNS

Existing documentation URL(s)

https://developers.cloudflare.com/support/third-party-software/others/configure-cloudflare-and-heroku-over-https/

What changes are you suggesting?

In Step 2a:

To start, log in to your Cloudflare account, navigate to the DNS app and add a ‘www’ CNAME record that points to the custom domain (also known as DNS target) that you obtained in Step 1 above for your subdomain.

This isn't clear to me. The DNS target given from Heroku in step 1 is something like murmuring-egret-abc123.herokudns.com, while my custom domain is example.com. Which should be added to the www CNAME?

In Step 2b:

Add a CNAME record for your root (e.g. example.com) and point it to DNS target you obtained in Step 1 above for your domain.

This is saying to use the domain (example.com) as the Name for root in the CNAME, but in the UI it says to use @ for root. And again, should the value be my custom domain for the DNS target Heroku generates?

Additional information

No response