Update faq.mdx

Clarify how to update contact details inc. phone number

Author: simon-says

src/content/docs/registrar/faq.mdx

@@ -195,8 +195,13 @@ If the domain is within 5 days of the initial registration, the domain will be i
 
 If the domain is more than 5 days old, it will enter the redemption period and will remain in account until the redemption period expires and the registry releases the domain.
 
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+
+## Domain management
 
+### How can I update my telephone number, email, name or address?
 
+You can update both your default contact information and any individual Registrant, Administrator, Technical or Billing contact for your domain registrations by following [Registrant contact updates](/registrar/account-options/domain-contact-updates/). Details that may be updated include name, email, address, organisation and telephone number.
 
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