poweroff: update more information link

[spageektti]

• [ ] The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• [ ] The page(s) have at most 8 examples.
• [ ] The page description(s) have links to documentation or a homepage.
• [ ] The page(s) follow the content guidelines.
• [ ] The PR title conforms to the recommended templates.
• Version of the command being documented (if known):

[tldr-bot]

Hello! I've noticed something unusual when checking this PR:

• The page pages.es/linux/poweroff.md is outdated, based on number of commands.
• The page pages.it/linux/poweroff.md is outdated, based on number of commands.
• The page pages.zh/linux/poweroff.md is outdated, based on number of commands.

Is this intended? If so, just ignore this comment. Otherwise, please double-check the commits.

[tldr-bot]

Hello! I've noticed something unusual when checking this PR:

• The page pages.es/linux/poweroff.md is outdated, based on number of commands.
• The page pages.it/linux/poweroff.md is outdated, based on number of commands.
• The page pages.zh/linux/poweroff.md is outdated, based on number of commands.

Is this intended? If so, just ignore this comment. Otherwise, please double-check the commits.