Update README.md (#376)

<!-- This is an auto-generated comment: release notes by openai -->
### Summary by OpenAI

## Release Notes

### Documentation
- Updated README.md file with minor changes, including typo fixes and
section heading updates.

> 🎉 Here's to the words that guide our way,
> 
> To the typos caught, no longer astray.
> 
> With headings updated, clear as day,
> 
> Our README shines in a whole new way! 🌟
<!-- end of auto-generated comment: release notes by openai -->

Author: guritfaq

README.md

@@ -41,11 +41,11 @@ To use this tool, you need to add the provided YAML file to your repository and
 For more information on usage, examples, contributing, and FAQs, you can refer to the sections below. 
 
 - [Overview](#overview)
-- [Install](#instal)
-- [Conversation with OpenAI](#Conversation-with-OpenAI)
+- [Install](#install)
+- [Conversation with OpenAI](#conversation-with-openai)
 - [Examples](#examples)
 - [Contribute](#contribute)
-- [FAQs](#FAQs)
+- [FAQs](#faqs)
 
 ## Install
 ai-pr-reviewer runs as a GitHub Action.