Removed trailing space contained within link text (#2911)

## Motivation for the change, related issues

The trailing space contained within the "WordPress Playground" link
before the following period was making my eye twitch, this PR removes
it.

<img width="360" height="92" alt="Screenshot 2025-11-17 at 1 43 51 PM"
src="https://github.com/user-attachments/assets/28ebe34f-8b1d-4efc-8964-6d55e1b49d29"
/>

## Implementation details

Removed the trailing space

## Testing Instructions (or ideally a Blueprint)

Small copy-related fix, didn't bother with testing or a blueprint.

Author: jeffpaul

packages/playground/website/public/gutenberg.html

@@ -77,8 +77,7 @@
 		Powered by
 		<a href="https://developer.wordpress.org/playground">
 			WordPress Playground
-		</a>
-		. To build a previewer like this for your repository, check the
+		</a>. To build a previewer like this for your repository, check the
 		<a
 			target="_blank"
 			href="https://github.com/WordPress/wordpress-playground/blob/trunk/packages/playground/website/public/gutenberg.html"