[PR] [docs] Fix examples in redux.md
[PR] [docs] Fix examples in redux.md

Summary:
This PR fixes 2 typos in the documentation of Redux.

There is a missing `,` in two examples.
Closes https://github.com/facebook/flow/pull/4506

Reviewed By: mroch

Differential Revision: D7749517

Pulled By: mrkev

fbshipit-source-id: 4ea29d9f670f420753061cd48ba3318be55fa3c9

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