docs(aio):fix numbering of the three ways to access hero details

[benbraou]

Fixes #20628

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[x] Documentation content changes
[ ] angular.io application / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: #20628

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[mary-poppins]

You can preview 77dc0ba at https://pr20647-77dc0ba.ngbuilds.io/.

[gkalpak]

Using the same number (e.g. 1) works as well for creating number lists (and makes it easier to re-order or add/remove items). (As you can see in the preview, changing to 1,2,3 doesn't fix the actual issue.
Maybe there needs to be an empty line above the list. Can you make this change and see if it helps?

[benbraou]

Thanks for having took the time to review. I have checked the readme for Angular documentation project and see now how to preview the changes...
Indeed, an empty line is missing.

[mary-poppins]

You can preview 5eeb2cf at https://pr20647-5eeb2cf.ngbuilds.io/.

[mary-poppins]

You can preview 49f6832 at https://pr20647-49f6832.ngbuilds.io/.

[benbraou]

@gkalpak are you ok with the change now?

[gkalpak]

Very OK 😃

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