docs: fix grammar issues and typos

[wanderer163]

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
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• I confirm that this pull request does not address a security
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• I have added tests that prove my fix is effective or that my feature
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• I have added or changed the documentation.

Further Comments

[CLAassistant]

All committers have signed the CLA.

[aeneasr]

ty!