update comment in aptos_containers

[andrew2003]

Check List

• Don't forget to squash commits into meaningful chunks before merging
• Check every test passed.
• Did you split imports into std, third parties, and custom parts?
• Format your code.
  • cargo fmt
  • cargo clippy
  • taplo fmt --config taplo/taplo.toml
• Check unwrap, expect().
• Check clone().
• Check your commit messages.
• Have you added meaningful comments.

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