Enhancement: Unclear description of how to become a triager

[LamentXU123]

Describe the bug

Hi,

In the doc of triage-team. We've got this statment:

AFAIK, only core devs can open the request issue of triager on the core-workflow repository. But this statement could cause confusion that anyone can open it, which lead to some request issue opened by contributers themselves. I think we can make it clearer here.

Thank you!

Edited: PR at #1595 change the statement to:

Screenshots

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Additional context

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