<br> tags appearing in self-check questions in 5.11

[pearcej]

Please check the current issues I did and didn't see this elsewhere.

What Course are you in pythonds3

What Page were you on https://runestone.academy/ns/books/published/pythonds3/SortSearch/TheMergeSort.html

What is your username pearcej

Describe the bug One can see HTML tags in the text of the self-check questions. Also, there is an extra [ in Q-4 B