Small Action View Overview guide grammar and readability tweaks

I went through the Action Controller Overview guide making a few small changes to improve its grammar and readability (I hope!)
That's really helpful! Thank you, I'll keep that in mind, not only for this instance and for any future amends I might make. Thank you. I'll leave it as "a couple" for now.

Since this is my first time doing this, can I ask if I should my amend commit be squashed into the earlier commit, or is a separate commit preferred?