systemctl-link: add page

[TheRootDaemon]

Checklist

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The page(s) follow the style guide.
• The PR contains at most 5 new pages.
• The PR is authored by me, or has been human-reviewed if it was created with AI or machine translation software.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known):
• Reference issue: Let's document: systemctl #17684

[tldr-bot]

The build for this PR failed with the following error(s) at commit
5f2260b824dc5513a2b75b2d047af03c057c504e:

pages/linux/systemctl-link.md:
Error: Parse error on line 4:
...ink%20PATH%E2%80%A6>- Link a unit file
-----------------------^
Expecting 'END_INFORMATION_LINK_URL', got 'NEWLINE'
pages/linux/systemctl-link.md:4: TLDR011 Page never contains more than a single empty line

Please fix the error(s) and push again.

[DustMerlin]

Suggested change

	`systemctl link /{{path/to/service}}`
	`systemctl link {{path/to/service}}`

[Managor]

Huh, interesting. I went to test it and it can be relative, but it must have at least one directory separator.

[DustMerlin]

Suggested change

	`systemctl link /{{path/to/service1 /path/to/service2 ...}}`
	`systemctl link {{path/to/service1 path/to/service2 ...}}`

[Managor]

What is the command to undo these changes? Add it to a See also: section.