Add links to specific sections of Redux docs

[Shelob9]

#4452

Description

This adds links to Redux documentation for concepts mentioned in the article that are native to Redux.

How Has This Been Tested?

Using the preview in Github.

Checklist:

• [x ] My code is tested.
• [x ] My code follows the WordPress code style.
• [x ] My code follows has proper inline documentation.

[aduth]

cc @youknowriad : Was it your intention to avoid the abstraction having strict overlap with Redux?

[youknowriad]

Was it your intention to avoid the abstraction having strict overlap with Redux?

This was my intention for the API exposing the data. Since we're going with selectors, I don't mind adding links to the Redux docs to clarify some concepts (reducer, selectors,...)