Document creating an API key from the CLI (#25504) (#25510)

Frontport of #25504

Credit to @lonix1

Co-authored-by: lonix1 <40320097+lonix1@users.noreply.github.com>
Co-authored-by: delvh <dev.lh@web.de>

docs/content/doc/administration/command-line.en-us.md

@@ -108,6 +108,14 @@ Admin operations:
  - `--all`, `-A`: Force a password change for all users
  - `--exclude username`, `-e username`: Exclude the given user. Can be set multiple times.
  - `--unset`: Revoke forced password change for the given users
+ - `generate-access-token`:
+ - Options:
+ - `--username value`, `-u value`: Username. Required.
+ - `--token-name value`, `-t value`: Token name. Required.
+ - `--scopes value`: Comma-separated list of scopes. Scopes follow the format `[read|write]:<block>` or `all` where `<block>` is one of the available visual groups you can see when opening the API page showing the available routes (for example `repo`).
+ - Examples:
+ - `gitea admin user generate-access-token --username myname --token-name mytoken`
+ - `gitea admin user generate-access-token --help`
  - `regenerate`
  - Options:
  - `hooks`: Regenerate Git Hooks for all repositories