Clarify Dismissible paragraph in Understanding SC 1.4.13

[venkatvemuri28]

Summary

This PR addresses issue #1409 by clarifying one paragraph in the Dismissible section of Understanding SC 1.4.13 (Content on Hover or Focus).

The previous wording could be read as internally inconsistent because it focused on trigger size without clearly explaining the placement tradeoff.

What changed

• Updated one paragraph in understanding/21/content-on-hover-or-focus.html
• Clarified why the second method alone may be appropriate in some large-trigger scenarios

Before

For most triggers of relatively small size, it is desirable for both methods to be implemented. If the trigger is large, noticing the additional content may be of concern if it appears away from the trigger. In those cases, only the second method may be appropriate.

After

For most triggers, it is desirable for both methods to be implemented. If the trigger is large, positioning the additional content so it does not obscure the trigger may place that content further from the user's current pointer location, making it harder to notice. In those cases, only the second method may be appropriate.

Why

• Better explains the implementation tradeoff

Refs #1409

[netlify]

✅ Deploy Preview for wcag2 ready!

Name	Link
🔨 Latest commit	8b7ee12
🔍 Latest deploy log	https://app.netlify.com/projects/wcag2/deploys/69d2205f7502ac0008888f1b
😎 Deploy Preview	https://deploy-preview-5030--wcag2.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.