Added Missing Trailing periods in Experiment Settings Page

[shail-mehta]

What?

This PR adding the trailing period in the Experiment Settings Page

Why?

Modified the Experiment Settings Page to add the trailing period. This ensures consistency in the Experiment Settings Page.

Testing Instructions

1. Open Experimental Settings Page
2. Go to Blocks: disable TinyMCE and Classic block Option
3. See for Disables the TinyMCE and Classic block has missing trailing period

Screenshots

Before	After

[github-actions]

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Co-authored-by: shail-mehta <[email protected]>
Co-authored-by: Mamaduka <[email protected]>
Co-authored-by: t-hamano <[email protected]>

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[shail-mehta]

Thanks for the Review.

[Mamaduka]

The one e2e test failure is a known issue (#69392). I'm not sure about the other. Can you double check if this string isn't used in any e2e tests.

[t-hamano]

I'm not sure about the other.

Maybe it might be related to the recent core changes. See #69403

[shail-mehta]

I have checked in code and found string is not used in any other places, so might be its failing because of core changes #69403

[github-actions]

Flaky tests detected in 0047575.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/13678975138
📝 Reported issues:

• [Flaky Test] All navigation links should default to the body color and submenus and mobile overlay should default to a white background with black text #55304 in /test/e2e/specs/editor/blocks/navigation-colors.spec.js