Grammatical tweaks

Author: benoittgt

features/controller_specs/README.md

@@ -64,8 +64,8 @@ To specify outcomes, you can use:
 ## Headers
 
 We encourage you to use [request specs](https://relishapp.com/rspec/rspec-rails/docs/request-specs/request-spec) if you want
-to set headers in your call. If you still want to use a controller specs with custom http headers
-you could use `request.headers`:
+to set headers in your call. If you still want to use controller specs with custom http headers
+you can use `request.headers`:
 
     require "rails_helper"
 

features/controller_specs/headers.feature

@@ -1,11 +1,11 @@
 Feature: Headers
 
-  We recommend you to switch to request spec instead of controller spec
+  We recommend you to switch to request specs instead of controller specs
   if you want to set headers in your call.
-  If you still want to set headers in controller spec, you can use
+  If you still want to set headers in controller specs, you can use
   `request.headers` as mentioned bellow.
 
-  Scenario: Set header's value in controller spec
+  Scenario: Setting a header value in a controller spec
     Given a file named "spec/controllers/application_controller_spec.rb" with:
       """ruby
       require "rails_helper"