Remove incorrect info related with GPG sign

[outsideris]

Why:

Closes #11081

What's being changed:

No longer that is not true.

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Content directory changes

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Source	Staging	Production	What Changed
content/authentication/managing-commit-signature-verification/about-commit-signature-verification.md	Modified	Original

[ramyaparimi]

@outsideris
Thanks so much for opening a PR! I'll get this triaged for review ⚡

[lecoursen]

Looks great! 🎉 We'll get this merged up after we've lifted our freeze for Universe.

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