Update README.md for esp-modbus (IDFGH-14053)

[kabirwbt]

typo fixed in esp-modbus documentation

Description

I am building a project using esp-modbus. I was reading the documentation and found a typo. I wanted to fix it.

Related

Testing

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Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

[CLAassistant]

All committers have signed the CLA.

[github-actions]

Warnings

⚠️

Some issues found for the commit messages in this PR: the commit message "Update README.md": summary looks empty type/action looks empty Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 20 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

👋 Hello kabirwbt, we appreciate your contribution to this project!

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📘 Please review the project's Contributions Guide for key guidelines on code, documentation, testing, and more.

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🖊️ Please also make sure you have read and signed the Contributor License Agreement for this project.

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[alisitsyn]

@kabirwbt,

Thank you for contribution, the typo is confirmed and will be fixed. I will inform you once PR is merged.

[kabirwbt]

@alisitsyn thanks for considering this.