RFR - Ma edit reviews

I would actually test the editing of a review, not just that the link is present:

```ruby
    scenario "edit review from the bus detail page" do
      sign_in_as(review.user)
      visit bus_path(bus)
      click_on "Edit"
      fill_in "Body", with: "Some new text"
      click_on "Submit" # or Edit Review or whatever the button says

     expect(page).to have_content "Your review has been updated."
     expect(page).to have_content "Some new text"
    end
```