Fix RSpec/VerifiedDoubles Rubocop offenses
Fix instances of: https://docs.rubocop.org/rubocop-rspec/cops_rspec.html#rspecverifieddoubles in this project.
Edited by Evan Read
Fix instances of: https://docs.rubocop.org/rubocop-rspec/cops_rspec.html#rspecverifieddoubles in this project.