scripts/gen-examples uses dubious shell options and documents them wrong

[spookyvision]

# Exit on error and unset variable usage, and print each command before
# executing it
set -euo pipefail

1. none of these options print commands before executing. Did you let an LLM lie to you? (probably set -x comes closest to "print each command before executing")
2. -euo pipefail comes with interesting pitfalls and should not be applied to scripts as a blanket treatment. See here for more information.