Update the Gov note for account management to include username/email

[estherk15]

What does this PR do? What is the motivation?

• Updates the note for US1-FED account management
• DOCS-10456

Merge instructions

Merge readiness:

• Ready for merge

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Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/esther/docs-10456-update-account-management-us1-fed/account_management/

[drichards-87]

Left some suggestions on the PR and approved.

[estherk15]

/merge

[dd-devflow]

View all feedbacks in Devflow UI.
2025-04-01 20:15:22 UTC ℹ️ Start processing command /merge

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2025-04-01 20:15:30 UTC ℹ️ MergeQueue: waiting for PR to be ready

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2025-04-01 20:38:11 UTC ℹ️ MergeQueue: merge request added to the queue

The expected merge time in master is approximately 19m (p90).

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2025-04-01 20:55:03 UTC ℹ️ MergeQueue: This merge request was merged