fix(curriculum) update assertion for typography link element

[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.

Closes #54896

Could not use .getAttribute('href') due to leading dot in href attribute value.
Added semi-colon to close const variable in another assertion.

[Sembauke]

We should also be able to add a link to ./styles.css without a leading dot and slash: `styles.css"