Fix typos in documentation for using Viem and formatting instructions

[Dimitrolito]

This pull request addresses minor typo corrections in the Hardhat documentation. The changes improve readability and grammatical accuracy in the following files:

1. using-viem.md: Corrected the usage of the article from "an" to "a" before "bigint" to align with proper grammatical rules.
2. formatting.md: Added a hyphen in "right-clicking" to ensure correct spelling of the term.

These are minor updates with no impact on functionality, intended to enhance the clarity and professionalism of the documentation.

---

Checklist

• Typographical corrections applied.
• No changes to functionality or code behavior.
• No new features introduced or discussed in an issue.

---

Additional Information

• Maintainers are welcome to edit this PR for additional refinements.
• This is a small fix with no breaking changes.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 75c9b71

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
hardhat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 2, 2024 4:05pm

[gitpoap-bot]

Congrats, your important contribution to this open-source project has earned you a GitPOAP!

GitPOAP: 2024 Hardhat Contributor:

Head to gitpoap.io & connect your GitHub account to mint!

Learn more about GitPOAPs here.