Update README.md

[baflQA]

Add disabling VNC info, fix typos

Thanks for contributing to the Docker-Selenium project!
A PR well described will help maintainers to quickly review and merge it

Before submitting your PR, please check our contributing guidelines, applied for this repository.
Avoid large PRs, help reviewers by making them as simple and short as possible.

Description

Motivation and Context

Types of changes

• 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

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[diemol]

Thank you, @baflQA!