Update glossary.md for namespace switching

[mjang]

Proposed changes

Checklist

Before sharing this pull request, I completed the following checklist:

• I read the Contributing guidelines
• My branch adheres to the Git conventions
• My content changes adhere to the F5 NGINX Documentation style guide
• If my changes involve potentially sensitive information¹, I have assessed the possible impact
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Footnotes

1. Potentially sensitive information includes personally identify information (PII), authentication credentials, and live URLs. Refer to the style guide for guidance about placeholder content. ↩

[github-actions]

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[mjang]

Shared with Kamal C for SME review.

[kamalchaturvedi]

Do we document anywhere how can customer perform this deregistering ? Might be confusing for the customer to figure it out unless we explicitly state it.