Fix shoulda-matchers typo in guide and test

FEATURES.md

@@ -90,14 +90,14 @@ spec/support/should_matchers.rb
 ```
 
 - Uses [action_dispatch-testing-integration-capybara][] to introduce Capybara assertions into Request specs.
-- Uses [should-matchers][] for simple one-liner tests for common Rails functionality.
+- Uses [shoulda-matchers][] for simple one-liner tests for common Rails functionality.
 - Uses [webmock][] for stubbing and setting expectations on HTTP requests in Ruby.
 
 [RSpec]: http://rspec.info
 [RSpec Rails]: https://github.com/rspec/rspec-rails
 [default test suite]: https://guides.rubyonrails.org/testing.html
 [action_dispatch-testing-integration-capybara]: https://github.com/thoughtbot/action_dispatch-testing-integration-capybara
-[should-matchers]: https://github.com/thoughtbot/shoulda-matchers
+[shoulda-matchers]: https://github.com/thoughtbot/shoulda-matchers
 [webmock]: https://github.com/bblimke/webmock
 
 ### Factories

lib/generators/suspenders/testing_generator.rb

@@ -19,14 +19,14 @@ class TestingGenerator < Rails::Generators::Base
         ```
 
         - Uses [action_dispatch-testing-integration-capybara][] to introduce Capybara assertions into Request specs.
-        - Uses [should-matchers][] for simple one-liner tests for common Rails functionality.
+        - Uses [shoulda-matchers][] for simple one-liner tests for common Rails functionality.
         - Uses [webmock][] for stubbing and setting expectations on HTTP requests in Ruby.
 
         [RSpec]: http://rspec.info
         [RSpec Rails]: https://github.com/rspec/rspec-rails
         [default test suite]: https://guides.rubyonrails.org/testing.html
         [action_dispatch-testing-integration-capybara]: https://github.com/thoughtbot/action_dispatch-testing-integration-capybara
-        [should-matchers]: https://github.com/thoughtbot/shoulda-matchers
+        [shoulda-matchers]: https://github.com/thoughtbot/shoulda-matchers
         [webmock]: https://github.com/bblimke/webmock
       MARKDOWN