docs: update adding events how-to to use new config style

[navinkarkera]

Description: Updates how-doc to reflect changes from ADR: 114

ISSUE: N/A

Dependencies: None

Reviewers:

• tag reviewer
• tag reviewer

Merge checklist:

• All reviewers approved
• CI build is green
• Version bumped
• Changelog record added
• Documentation updated (not only docstrings)
• Commits are squashed

Post merge:

• Create a tag
• Check new version is pushed to PyPI after tag-triggered build is
  finished.
• Delete working branch (if not needed anymore)

Author concerns: List any concerns about this PR - inelegant
solutions, hacks, quick-and-dirty implementations, concerns about
migrations, etc.

[openedx-webhooks]

Thanks for the pull request, @navinkarkera!

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[navinkarkera]

@mariajgrimaldi Thanks! It should render fine as edx-platform has same format here

[bmtcril]

👍