Fix grammar and clarity issues in index.mdx

[AaryanBansal-dev]

Pull Request Title: Improve Grammar and Clarity in Documentation

Summary of Changes

This pull request addresses various grammar and clarity issues in the index.mdx documentation file of the Next.js project. The changes consist of 10 additions and 10 deletions, aimed at enhancing the readability and professionalism of the documentation.

Key Changes

• Grammar Corrections: Improved sentence structure and corrected grammatical errors throughout the document.
• Clarity Enhancements: Adjusted wording to provide clearer explanations, particularly in sections describing the App Router and Pages Router, as well as the prerequisites for using Next.js.
• Consistency Improvements: Standardized terminology (e.g., changing "three" to "3" for consistency with other lists) to ensure uniformity across the documentation.

Reasons for Changes

The primary goal of these modifications is to enhance the user experience by providing clearer and more professional documentation. Improved grammar and clarity will help users better understand the features and functionalities of Next.js, ultimately facilitating a smoother onboarding process for new developers.

Benefits to the Project

• Enhanced Readability: Users will find it easier to comprehend the documentation, leading to a better understanding of Next.js.
• Professional Presentation: A polished documentation reflects positively on the project and its contributors, potentially attracting more users and contributors.
• Improved User Engagement: Clear instructions and descriptions can help reduce confusion, encouraging users to engage more with the framework.

Instructions for Reviewers

• Please focus on the clarity and accuracy of the changes made.
• Consider the overall flow of the documentation after the modifications.
• Provide feedback on any additional areas that may require further clarification or improvement.

Thank you for reviewing this pull request!

[ijjk]

Allow CI Workflow Run

• approve CI run for commit: cfafdb1

Note: this should only be enabled once the PR is ready to go and can only be enabled by a maintainer

[ijjk]

Allow CI Workflow Run

• approve CI run for commit: 6dfb877

Note: this should only be enabled once the PR is ready to go and can only be enabled by a maintainer