Runner tokens are multi use (#29153)

Fixes https://github.com/go-gitea/gitea/issues/28911.

Co-authored-by: Giteabot <teabot@gitea.io>

docs/content/usage/actions/act-runner.en-us.md

@@ -120,6 +120,8 @@ A registration token can also be obtained from the gitea [command-line interface
 gitea --config /etc/gitea/app.ini actions generate-runner-token
 ```
 
+Tokens are valid for registering multiple runners, until they are revoked and replaced by a new token using the token reset link in the web interface.
+
 ### Register the runner
 
 The act runner can be registered by running the following command:

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

@@ -61,8 +61,8 @@ It is always a bad idea to use a loopback address such as `127.0.0.1` or `localh
 If you are unsure which address to use, the LAN address is usually the right choice.
 
 `token` is used for authentication and identification, such as `P2U1U0oB4XaRCi8azcngmPCLbRpUGapalhmddh23`.
-It is one-time use only and cannot be used to register multiple runners.
-You can obtain different levels of 'tokens' from the following places to create the corresponding level of' runners':
+Each token can be used to create multiple runners, until it is replaced with a new token using the reset link.
+You can obtain different levels of 'tokens' from the following places to create the corresponding level of 'runners':
 
 - Instance level: The admin settings page, like `<your_gitea.com>/admin/actions/runners`.
 - Organization level: The organization settings page, like `<your_gitea.com>/<org>/settings/actions/runners`.