[Docs] Carousel caption color in dark mode

Created by: bastienmoulia

Prerequisites

• I have searched for duplicate or closed issues
• I have validated any HTML to avoid common problems
• I have read the contributing guidelines

Describe the issue

In the carousel docs on dark mode, the caption have different colors.

Reduced test cases

On the page https://getbootstrap.com/docs/5.3/components/carousel/#captions in dark mode the title and subtitles have different colors:

Same for https://getbootstrap.com/docs/5.3/components/carousel/#dark-variant

What operating system(s) are you seeing the problem on?

Windows

What browser(s) are you seeing the problem on?

Chrome

What version of Bootstrap are you using?

5.3.0