gdisk: add page

[zhuhongboAAA]

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: #

[tldr-bot]

The build for this PR failed with the following error(s) at commit
d63a8e1a8b1666c9f7a0d63ca38a8acdbcfa95a4:

pages/linux/gdisk.md:0: TLDR019 Page should only include a maximum of 8 examples

Please fix the error(s) and push again.

[Managor]

Use the github UI commit buttons so that you apply the exact desired suggestion

[Managor]

I think write is more important than this. You could swap this with a write example.