Add sgdisk command to TLDR pages

[dheena017]

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: #

[CLAassistant]

All committers have signed the CLA.

[tldr-bot]

Hello! I've noticed something unusual when checking this PR at commit
d0af33e8d3677f0d7797dae4b81740205ec2b592:

• The page pages/linux/sgdisk.md already exists in the common directory.

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

[Managor]

#19290