minicom: add more examples

[Harrisonust]

• 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.
• Version of the command being documented (if known):

[Managor]

Thanks

[Harrisonust]

Also, I am thinking whether the last example is trivial. Should I remove it in this PR?

- Display help:

`minicom {{[-h|--help]}}`

[Managor]

Don't. The help and version commands are filler. They are the first examples to be cut if the examples start to go over 8

See the style guide here https://github.com/tldr-pages/tldr/blob/main/contributing-guides/style-guide.md#help-and-version-commands