Featured Content: Add messaging letting users know the tag name is case sensitive

[coder-karen]

Fixes #42051

Proposed changes:

• This PR adds a sentence below the Featured Content section description (in the Customize) to clarify that the tag name must be case sensitive.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

n/a

Does this pull request change what data or activity we track or use?

Testing instructions:

To test on a self-hosted site, apply this PR locally (or using the Jetpack Beta tester plugin - as with a WoA test site). For Simple - apply the PR by using the command in the generated comment below for a sandboxed Simple site.

• Install and activate a theme that uses Featured Content such as Dara.
• Open up the Customizer, and open up the Featured Content section.
• You should see a new sentence explaining that the tag name is case sensitive.

[github-actions]

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[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WoA dev site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin (Jetpack or WordPress.com Site Helper), and enable the add/featured-content-tag-case-message branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack add/featured-content-tag-case-message

bin/jetpack-downloader test jetpack-mu-wpcom-plugin add/featured-content-tag-case-message

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• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
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[jp-launch-control]

Code Coverage Summary

Coverage changed in 1 file.

File	Coverage	Δ%	Δ Uncovered
projects/packages/classic-theme-helper/src/class-featured-content.php	0/285 (0.00%)	0.00%	8 💔

Full summary · PHP report · JS report

_{Coverage check overridden by I don't care about code coverage for this PR Use this label to ignore the check for insufficient code coveage. .}

[jeherve]

This looks good to me. Given that the description is within a div, I was wondering if it may be better to use a br to denote the line break instead of a p, but I don't think that really matters that much :)

[coder-karen]

I was wondering if it may be better to use a br to denote the line break instead of ap

Thanks for the review! Happy to change it - I like the additional line as it highlights the message a little more, so added two line breaks to give the appearance of a new paragraph.