chore: minor improvement for docs

[ledigang]

Summary

Closes #_

• [ ] y/n | Does it introduce breaking changes?
• [ ] y/n | Is it dependent on a specific version of cargo-contract or pallet-revive?

minor improvement for docs

Description

Checklist before requesting a review

• [ ] I have added an entry to CHANGELOG.md
• [ ] I have commented on my code, particularly in hard-to-understand areas
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] Any dependent changes have been merged and published in downstream modules

[ledigang]

Thank you!

@Daanvdplas My pleasure. If there's anything need I to do, please feel free to tell me.

[cmichi]

@ledigang The CI is failing due to cargo fmt. Can you run

find . -name "Cargo.toml"  | xargs -n1 -I{} bash -c "echo {}; cargo +nightly fmt --all --manifest-path={}"

in the repository?

[ledigang]

@ledigang The CI is failing due to cargo fmt. Can you run

find . -name "Cargo.toml"  | xargs -n1 -I{} bash -c "echo {}; cargo +nightly fmt --all --manifest-path={}"

in the repository?

@cmichi @Daanvdplas Thank you for your approval.

Rebased and executed the cmd.

Please review it again.