Changing account email address

# Changing account email address

## Finding
All users asked how to change the email tied to their InfluxDB Cloud account, but the bot could not find any documentation. It only referenced billing-contact updates and therefore told users to contact support, leaving the actual procedure or its feasibility unclear.

## Suggestion
Add a clear doc section (or an explicit note) on whether and how a user can change the primary account email—via UI, CLI, or support ticket—and link it from account-management and billing pages.

## Conversations
- I need to change the email in my account
- change email
- how to change my email ?

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Explore user conversations on:
https://app.kapa.ai/720100f9-ce93-4305-88fd-5fcf71effad7/coverage-gaps/clusters/d24daa0d-ee98-4ab0-9cfa-48a502a49f78

Start by reviewing the existing account-management and billing documentation to determine whether primary email changes are supported through the UI, CLI, or support. Done means the supported procedure or an explicit limitation is documented in a clear section and linked from the relevant account-management and billing pages.

Written by the indexing model from the issue text.