fix(curriculum): typo in multi-choice hint

[Supravisor]

Checklist:

• [x] I have read and followed the contribution guidelines.
• [x] I have read and followed the how to open a pull request guide.
• [x] My pull request targets the main branch of freeCodeCamp.
• [x] I have tested these changes either locally on my machine, or Gitpod.

Closes #XXXXX

[gikf]

Would you be willing to fix other occurrences of this problem?

https://github.com/freeCodeCamp/freeCodeCamp/blob/ccf1a83b4edda2db58ca78c9a4dea6854581cffe/curriculum/challenges/english/25-front-end-development/workshop-nutritional-label/615f34ecc1091b4fd5a8a484.md?plain=1#L24

https://github.com/freeCodeCamp/freeCodeCamp/blob/ccf1a83b4edda2db58ca78c9a4dea6854581cffe/curriculum/challenges/english/14-responsive-web-design-22/learn-typography-by-building-a-nutrition-label/615f34ecc1091b4fd5a8a484.md?plain=1#L24

https://github.com/freeCodeCamp/freeCodeCamp/blob/ccf1a83b4edda2db58ca78c9a4dea6854581cffe/curriculum/challenges/english/25-front-end-development/lecture-working-with-common-string-methods/67326c0d7bef01c539120766.md?plain=1#L29

https://github.com/freeCodeCamp/freeCodeCamp/blob/ccf1a83b4edda2db58ca78c9a4dea6854581cffe/curriculum/challenges/english/25-front-end-development/lecture-importance-of-accessibility-and-good-html-structure/672a54ce90c19e9038f481d7.md?plain=1#L21

[Supravisor]

Yes, I can fix the problems. Done