fix(curriculum): replace D.O.B. acronym in accessibility quiz

[Supravisor]

Checklist:

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

Related to #47830

[Supravisor]

Is it okay for this PR to proceed without further changes?

Then the should fix can be applied on Question 1 and Question 2 using the sr-only class, in a separate PR.
Otherwise another issue may need to merge into this one.

[bbsmooth]

Is it okay for this PR to proceed without further changes?

I would vote no.

"Although the Date of Birth text is descriptive, it can be problematic for visually impaired users."

This doesn't make sense. Date of Birth is not problematic for visually impaired users. Also, you wouldn't add visually hidden text that is exactly the same as the visible text. That's just unnecessary duplication for screen reader users.

It's not just a matter of changing D.O.B to Date of Birth. This entire step needs to be reworked.