docs: Add breadcrumb separator example and documentation
This MR:
- Adds some documentation on how to use the slot
- Adds additional example with a different separator
NOTE:
This MR, as you will evidence by the discussions, has changed in scope. It started as a fix for some styles, after which we realized we needed to improve some of the breadcrumb docs and add examples. The styles got fixed in another MR, so this will only have the docs and examples updates.
Originally closed gitlab#15523 (closed)
Edited by 🤖 GitLab Bot 🤖