Use Cloudflare in comments

What does this MR do?

Uses "Cloudflare" in Ruby code comments.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [n/a] Documentation (if required)
• Code review guidelines
• [n/a] Merge request performance guidelines
• Style guides
• [n/a] Database guides
• Separation of EE specific content

Closes #231329 (closed)

cf. Changes in docs: !37704 (merged)