fix: CLI command text review

[moorejacqueline]

What does this PR do?

Suggest revisions to --help text for lightning preview app and lightning preview site to make sure content aligns with CX standards.

What issues does this PR fix or reference?

@W-15924073@

[maliroteh-sf]

LGTM 👍

[khawkins]

A couple of suggestions, but overall this seems good to me!

[jshackell-sfdc]

@moorejacqueline , the help looks awesome! Very nice job.

Most of my comments are either suggestions for adding a tad more information to help the user, or me being a bit confused about wording, possibly because I'm just not that familiar with LWC. I have a few direct edits, but nothing big.

Important: please make sure that the site.ts file is updated to show the command description (i added a comment) -- currently, because the crucial line was removed, the --help isn't showing any command description at all.

Happy to do a second review after you deal with my first review, but only if you want -- it's not necessary. Cheers!

[moorejacqueline]

@nrkruk @jshackell-sfdc noticed the lightning.preview.component.md file, and we're wondering if we should remove it or leave it alone (since it sounds like we aren't supporting sf lightning preview component in 252). Thanks!

[jshackell-sfdc]

@moorejacqueline , see a few little edits, nothing big. Otherwise, the help looks great!

I'm sure devs are on it, but just for completeness, I noticed these two things:

• the command lightning preview component is still showing up when I run sf lightning preview --help; I think it needs to be hidden?
• These commands are going out as beta first, right? If so, they should be marked as such in the code; see https://github.com/salesforcecli/plugin-devops-center/blob/main/src/commands/project/deploy/pipeline/quick.ts#L20 for an example.

Thanks!

FYI @nrkruk