Corrected documentation for contact_person.

[dino8890]

Description

This PR fixes invalid examples given in the documentation for the contact_person setting, and expands upon the existing description in a minor way.

Not sure how you want CHANGELOG.md to be formatted, but it might be worthwhile since invalid configuration is likely used in production deployments. No tests are needed as this is a documentation change.

Checklist

• [x] Checked that no other issues or pull requests exist for the same issue/change
• [ ] Added tests covering the new functionality
• [x] Updated documentation OR the change is too minor to be documented
• [ ] Updated CHANGELOG.md OR changes are insignificant

[vladimir-mencl-eresearch]

Looks very reasonable to me @c00kiemon5ter .