scamper, sc_*: clarify that warts is a file format

[waldyrious]

Scamper's documentation explicitly refers to "warts" as a file format.

Using the .warts form in the command descriptions, instead of just warts, makes this more explicit and intuitive.

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: #

[Managor]

🤔
This could be standardized in the style guide.

[waldyrious]

This could be standardized in the style guide.

Honestly, I was checking the style guide and it feels like it's quite bloated already 😅 I'm hesitant to add yet another guideline for something that in practice isn't a super common issue (nor, admittedly, that problematic anyway).

[Managor]

The hesitation goes away when you consider the style guide less as a bible, but a collection of best practices. This feels very similar to environment variable change in #19685

[waldyrious]

This could be standardized in the style guide.

For future reference, this was proposed in #19776.