Enhance Docker Docs README: Fix Issues, Improve Clarity, and Update Contribution Guidelines

[Raghu0703]

This pull request significantly improves the Docker Documentation repository's README by addressing multiple issues including truncated text, broken links, and outdated phrases. The content has been modernized for better readability and clearer instructions on providing feedback and contributing to the docs. Key enhancements include:

Corrected the Docker logo alt text for accessibility.

Repaired incomplete and broken link URLs.

Updated the feedback section with precise steps for submitting issues and using the community Slack.

Clarified licensing information with a direct reference to the Apache 2.0 license.

Improved section headings for better navigation and emphasis.

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[Raghu0703]

Hi maintainers 👋

This is a small and straightforward contribution (minor text/API addition) with no breaking changes.

If everything looks good, could you please merge this PR at your earliest convenience?
It would help me complete my first open-source contribution and continue learning. 🚀

Thank you for maintaining this amazing project! 🙏
– Raghu0703 ([email protected])

[Raghu0703]

Hi maintainers 👋

This is a small and straightforward contribution (minor text/API addition) with no breaking changes.
let me know if you want to change anything else