Update docs to reflect that runner tokens are now reusable

[scottyeager]

Feature Description

With #27304, action runner registration tokens are now reusable. However the docs still specify that they are single use:

gitea/docs/content/usage/actions/quickstart.en-us.md

Lines 63 to 64 in 1ca947b

	`token` is used for authentication and identification, such as `P2U1U0oB4XaRCi8azcngmPCLbRpUGapalhmddh23`.
	It is one-time use only and cannot be used to register multiple runners.

Screenshots

No response

[lunny]

Would you like to send a PR to fix that?

[scottyeager]

Sure, happy to!

PS, I didn't see an issue form type for documentation.

[github-actions]

Automatically locked because of our CONTRIBUTING guidelines