fix grammatical mistakes and improve clarity in docs .md

[Alex-Roleks]

This PR improves the documentation by fixing grammatical mistakes and improving clarity.

Changes

• docs/src/content/hardhat-chai-matchers/docs/overview.md
  Reworded a sentence for better readability.

• docs/src/content/hardhat-chai-matchers/docs/reference.md
  Standardized capitalization of "JavaScript."

• docs/src/content/hardhat-runner/docs/advanced/artifacts.md
  Corrected "json" to "JSON" for consistency.

• docs/src/content/hardhat-runner/docs/advanced/building-plugins.md
  Corrected "key component" to "key components" for singular/plural agreement in a sentence.

PR Checklist

• Because this PR includes a bug fix, relevant tests have been included.
• Because this PR includes a new feature, the change was previously discussed on an Issue or with someone from the team.
• I didn't do anything of this.

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Latest commit: 168950b

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