netstat: add option placeholders

[CleanMachine1]

• 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 page(s) follow the style guide.
• The PR title conforms to the recommended templates.

No one is ever typing all of that out.

[Managor]

If you could, please apply option placeholders to the whole page.