chore: minor improvement for docs

[ledigang]

👮🏻👮🏻👮🏻 !!!! REFERENCE THE PROBLEM YOUR ARE SOLVING IN THE PR TITLE AND DESCRIBE YOUR SOLUTION HERE !!!! DO NOT FORGET !!!! 👮🏻👮🏻👮🏻

minor improvement for docs

PR Checklist:

• Have you read the CONTRIBUTING.md?
• Does your PR follow the C4 patch requirements?
• Have you rebased your work on top of the latest master?
• Have you checked your code compiles? (make)
• Have you included tests for any non-trivial functionality?
• Have you checked your code passes the unit tests? (make test)
• Have you checked your code formatting is correct? (go fmt)
• Have you checked your basic code style is fine? (golangci-lint run)
• If you added any dependencies, have you checked they do not contain any known vulnerabilities? (go list -json -m all | nancy sleuth)
• If your changes affect the client infrastructure, have you run the integration test?
• If your changes affect public APIs, does your PR follow the C4 evolution of public contracts?
• If your code changes public APIs, have you incremented the crate version numbers and documented your changes in the CHANGELOG.md?
• If you are contributing for the first time, please read the agreement in CONTRIBUTING.md now and add a comment to this pull request stating that your PR is in accordance with the Developer's Certificate of Origin.

Thank you for your code, it's appreciated! :)

[ledigang]

@thomas-nguy Hi, Could you please review this PR at your convenience? Thank you very much.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 30.85%. Comparing base (606d520) to head (4c570ad).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1216      +/-   ##
==========================================
- Coverage   33.50%   30.85%   -2.66%     
==========================================
  Files         105      113       +8     
  Lines       15728    15989     +261     
==========================================
- Hits         5270     4933     -337     
- Misses       9415    10187     +772     
+ Partials     1043      869     -174     

Flag	Coverage Δ
integration_tests	?
integration_tests_byzantine	11.52% <ø> (ø)
integration_tests_gov	11.76% <ø> (ø)
integration_tests_grpc	11.76% <ø> (ø)
integration_tests_ibc	26.76% <ø> (ø)
integration_tests_ledger	11.74% <ø> (ø)
integration_tests_slow	11.74% <ø> (ø)
integration_tests_solomachine	11.55% <ø> (ø)
integration_tests_upgrade	11.76% <ø> (ø)
unit_tests	13.01% <ø> (?)

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