Update docs: Add s to come

[Thalmann]

---

name: :memo: Documentation Fix about: Fixing a problem in an existing docs page

Checklist

• [ ] Is there an existing issue for this PR?
  • link issue here
• [ ] Have the files been linted and formatted?

What docs page needs to be fixed?

• Section: https://redux.js.org/tutorials/essentials/part-5-async-logic#using-middleware-to-enable-async-logic
• Page: https://redux.js.org/tutorials/essentials/part-5-async-logic#using-middleware-to-enable-async-logic

What is the problem?

Missing s

What changes does this PR make to fix the problem?

Adds an s

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[timdorr]

"Middleware" is plural in this case, so we should be using a singular verb. This is correct as-is.

[Thalmann]

@timdorr Fair enough. I was thinking "comes in" because we were referring to the middleware concept or system as a singular entity. Not a big deal at all ofc.