delpart: add page

[FarzadHayat]

• 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 PR title conforms to the recommended templates.
• Version of the command being documented (if known): 2.38.1

For delpart command as part of util-linux in #2214
Sudo is necessary to get correct permission level.

I think adding a concrete example like:
sudo delpart /dev/sda 1
would help provide more clarity on how to use the command.
I'm not sure whether this would fit into the tldr page structure though.

[kbdharun]

Welcome to tldr and thanks for your contribution.

LGTM, after @acuteenvy's suggestions.