update several more code blocks in curriculum content with new formatting

[Hamms]

Pass 3: The Stuff We Missed

Follow-up to #39839

Turns out, the scoping regex I was using - text.gsub(/(?<!\[)`[^`]*`/) - is insufficient. In particular, it's too greedy: it was matching against whole paragraphs, and skipping over any relevant content that might be inside those paragraphs. I updated it to actually use the block regex directly: text.gsub(/(?<!\[)#{BLOCK_RE}/) and it found a bunch of things that it had been missing before.

PR Checklist:

• Tests provide adequate coverage
• Privacy and Security impacts have been assessed
• Code is well-commented
• New features are translatable or updates will not break translations
• Relevant documentation has been added or updated
• User impact is well-understood and desirable
• Pull Request is labeled appropriately
• Follow-up work items (including potential tech debt) are tracked and linked

[dmcavoy]

Thank you for doing this!