Update: Improve overrides modal for enabling and disabling

[shreya0204]

What?

This update enhances the text descriptions in the Enable Overrides and Disable Overrides modals.

Closes #61542

Why?

The previous descriptions in the modals were concise but could lead to confusion about what exactly happens when overrides are enabled or disabled. The updated text is intended to provide a clearer, more direct explanation suitable for all users, helping them make informed decisions while managing block overrides.

How?

• Updated the text in the Enable Overrides modal to more explicitly describe the impact of enabling an override on a block within any synced pattern instance.
• Revised the Disable Overrides modal text to clarify the consequences of disabling an override, including how it affects the content across instances.

Testing Instructions

1. Ensure any full site editing (FSE) theme is active.
2. Navigate to the site editor.
3. Add a synced block pattern.
4. Insert a heading block.
5. Open the right-side inspector controls.
6. Expand the Advanced section.
7. Click on the "Enable Overrides" button; the modal will display the updated message.
8. Enter a name for the block and click Enable.
9. After enabling, select the heading block again and click on Disable Overrides, the modal with the updated message about disabling will appear.

Testing Instructions for Keyboard

Screenshots or screencast

Enable

Disable

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Co-authored-by: richtabor <[email protected]>
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[github-actions]

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[richtabor]

I'm missing the explanation of what an override is, from the previous iteration. And so few people will read that long paragraph of content when disabling.

[ellatrix]

@talldan Is this something that is needed for 6.6?

[talldan]

Is this something that is needed for 6.6?

@ellatrix I've removed the label. Given the string freeze is soon, it seems fine to bump it until there's more clarity on the right copy.