docs: fix typos in docs

[serikssonn]

Description

This PR fixes a bunch of typos in the curriculum docs—makes it easier to read and more professional.

Changes Made

• javascript/newer-JS-features.md: "javscript" → "javascript" , "elemnts" → "elements"
• javascript/require-and-import-mini-lesson.md: "convienience" " → "convenience"
• javascript/restaurant recommender/design_yelp.py: "restauraunts" → "restaurants"
• web/css-part-2.md: "throughly" → "thoroughly"
• web/html-forms.md: "Helful" → "Helpful"