Registrant contact updates

[simon-says]

Summary

Additions to clarify how to update contact information for Registrar, including phone number.

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PR Change Summary

Clarified the process for updating contact information for Registrar, including phone number.

• Added details on the types of contact information that can be updated.
• Included instructions for updating registrant contacts in the FAQ.
• Enhanced the FAQ section with a new question about updating contact details.

Modified Files

• src/content/docs/registrar/account-options/domain-contact-updates.mdx
• src/content/docs/registrar/faq.mdx

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