sgdisk: add page

[godwiniheuwa]

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):

Closes: #19275

[tldr-bot]

The build for this PR failed with the following error(s) at commit
33d687dbfc8c8a22172615ee8a91eb2c05c5e5ca:

pages/common/sgdisk.md:3: TLDR014 Page should contain no trailing whitespace
pages/common/sgdisk.md:4: TLDR014 Page should contain no trailing whitespace

Please fix the error(s) and push again.

[Managor]

Suggested change

	> Command-line tool for managing GUID Partition Tables (GPT) on Linux and Unix.
	> Manage GUID Partition Tables (GPT).

[Managor]

Suggested change

	`sgdisk {{[-m|--gpttombr]}}={{1:2:3:4}} {{/dev/sdX}}`
	`sgdisk {{[-m|--gpttombr]}} {{1:2:3:4}} {{/dev/sdX}}`

Does the command work without =?

[Managor]

Suggested change

	`sgdisk {{[-d|--delete]}}={{1}} {{/dev/sdX}}`
	`sgdisk {{[-d|--delete]}} {{1}} {{/dev/sdX}}`

Same question here

[Managor]

Suggested change

	`sgdisk {{[-b|--backup]}}={{/path/to/backup.gpt}} {{/dev/sdX}}`
	`sgdisk {{[-b|--backup]}} {{/path/to/backup.gpt}} {{/dev/sdX}}`

[Managor]

Suggested change

	`sgdisk {{[-l|--load-backup]}}={{/path/to/backup.gpt}} {{/dev/sdX}}`
	`sgdisk {{[-l|--load-backup]}} {{/path/to/backup.gpt}} {{/dev/sdX}}`