Update multi-stage-builds.md to remove forced linebreak (#21907)

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## Description

I removed linebreaks in multi-stage-builds.md. These linebreaks rendered
awkwardly in my browser and aren't used in other areas of the page.

Firefox screenshot:

<img width="802" alt="Screenshot 2025-01-27 at 6 27 28 PM"
src="https://github.com/user-attachments/assets/ac729e1a-0a5f-440c-a92c-8e7579eee6d3"
/>

## Reviews

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- [ ] Technical review
- [ ] Editorial review
- [ ] Product review

Author: alexandertuna

content/get-started/docker-concepts/building-images/multi-stage-builds.md

@@ -325,9 +325,7 @@ Now that you have the project, you’re ready to create the `Dockerfile`.
     Your final image is just 428 MB, compared to the original build size of 880 MB.
 
 
-    By optimizing each stage and only including what's necessary, you were able to significantly reduce the   
-    overall image size while still achieving the same functionality. This not only improves performance but   
-    also makes your Docker images more lightweight, more secure, and easier to manage.
+    By optimizing each stage and only including what's necessary, you were able to significantly reduce the overall image size while still achieving the same functionality. This not only improves performance but also makes your Docker images more lightweight, more secure, and easier to manage.
 
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