fix(docs): merge 2 "Carousel" sections in the migration guide (#1870)

site/content/docs/5.3/migration.md

@@ -66,6 +66,7 @@ Learn more by reading the new [color modes documentation]({{< docsref "/customiz
 
 - **Carousel**
  - The examples in our docs are now explicitly initialized and mostly don't use anymore `data-bs-ride`. Depending on how carousels are used in your project, it might need some updates.
+ - <span class="badge text-danger-emphasis bg-danger">Breaking</span> The pause/play button is now included within the carousel for a better rendering but still respecting accessibility guidelines; it is now placed on the left-hand side of the indicators. The HTML markup has changed, please use this new version on your websites.
 
 - **List group**
  - List group item variants are now styled via CSS variables.
@@ -126,9 +127,6 @@ Learn more by reading the new [color modes documentation]({{< docsref "/customiz
  </div>
  ```
 
-- **Carousel**
- - <span class="badge text-danger-emphasis bg-danger">Breaking</span> The pause/play button is now included within the carousel for a better rendering but still respecting accessibility guidelines; it is now placed on the left-hand side of the indicators. The HTML markup has changed, please use this new version on your websites.
-
 ### Forms
 
 - `.form-control` is now styled with CSS variables to support color modes. This includes the addition of two new root CSS variables for the default and disabled form control backgrounds.