Add documentation for table nest option

[MarcoGriep]

Description

Add documentation for table nest Option.
You need this option, if you want to add the mixin only to a specified table.

Types of changes

• Documentation
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (anything that would change an existing functionality)
• Maintenance (refactor, code cleaning, development tools...)

Checklist

• I have read and follow the CONTRIBUTING.md document.
• The pull request title and template are correctly filled.
• The pull request targets the right branch (develop or develop-v...).
• My commits are correctly titled and contain all relevant information.
• I have updated the documentation accordingly to my changes (if relevant).
• I have added tests to cover my changes (if relevant).

[DanielRuf]

👋 @MarcoGriep,

thanks for your pullrequest and thanks for catching this one.

@ncoden we should check the rest of the docs too if some parameters are not properly documented. I do not know if we can test this with some linting rules.

cc @SassNinja

[joeworkman]

This pull request has been mentioned on Foundation Open Source Community. There might be relevant details there:

https://foundation.discourse.group/t/foundation-for-sites-v6-6-0-is-here-farout/30/1