Update index.md

[nimithajalal]

Typo correction, content clarity and grammar check

Performed typo corrections, suggested changes for content clarity and did grammar check in the documentation.

Description

There were missing commas, spelling mistakes and vague content in the documentation.

Related Issue

Motivation and Context

Clearer content and adhering to documentation standards.

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• [ x] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x ] I have signed the Adobe Open Source CLA.
• [ x] My code follows the code style of this project.
• [ x] My change requires a change to the documentation.
• [x ] I have updated the documentation accordingly.
• x[ ] I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[nimithajalal]

Gtg