More generic 'describe' description

Author: benoittgt

spec/rspec/rails/configuration_spec.rb

@@ -257,7 +257,7 @@ def self.application; end
       expect(group.new).to be_a(RSpec::Rails::MailerExampleGroup)
     end
 
-    describe 'cleans test mailbox between each example in all rspec-rails example' do
+    describe 'leans test mailbox after each example' do
       class BaseMailer < ActionMailer::Base
         default from: '[email protected]'