update docs for person-page header component to match new markup

Description

mirrors changes in the docs, related to:
- 36
https://deploy-preview-40--vocabulary-docs.netlify.app/#person-header-region

Checklist

[x] My pull request has a descriptive title (not a vague title like Update index.md).
[x] My pull request targets the default branch of the repository (main or master).
[x] My commit messages follow best practices.
[x] My code follows the established code style of the repository.
[ ] I added or updated tests for the changes I made (if applicable).
[x] I added or updated documentation (if applicable).
[x] I tried running the project locally and verified that there are no visible errors.

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Developer Certificate of Origin

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creativecommons / vocabulary