Improve Accessibility: Add Default Aria-Label, Update Docs

[ARXChrono]

• Add default values: The majority of users would not provide a custom label, but by default, it should be set to 'Play Video,' which can be overwritten if required. Currently, all video players using this are not compliant, but by default, they should be.
• Update documentation to include the existing previewAriaLabel.
• Update props and types.
• Ensure aria-label is used set correctly