Enables RSpec/DescribedClass cop & fixes all issues

Autocorrection for existing issues, and stashing at .rubocop_todo.yml
the false positives

Read about cop at http://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/DescribedClass

spec/models/verification/management/document_spec.rb

@@ -4,24 +4,24 @@ describe Verification::Management::Document do
   describe "#valid_age?" do
     it "returns false when the user is younger than the user's minimum required age" do
       census_response = double(date_of_birth: Date.new(User.minimum_required_age.years.ago.year, 12, 31))
-      expect(Verification::Management::Document.new.valid_age?(census_response)).to be false
+      expect(described_class.new.valid_age?(census_response)).to be false
     end
 
     it "returns true when the user has the user's minimum required age" do
       census_response = double(date_of_birth: Date.new(User.minimum_required_age.years.ago.year, 16.years.ago.month, 16.years.ago.day))
-      expect(Verification::Management::Document.new.valid_age?(census_response)).to be true
+      expect(described_class.new.valid_age?(census_response)).to be true
     end
 
     it "returns true when the user is older than the user's minimum required age" do
       census_response = double(date_of_birth: Date.new((User.minimum_required_age + 10).years.ago.year, 12, 31))
-      expect(Verification::Management::Document.new.valid_age?(census_response)).to be true
+      expect(described_class.new.valid_age?(census_response)).to be true
     end
   end
 
   describe "#under_age?" do
     it "returns true when the user is younger than the user's minimum required age" do
       census_response = double(date_of_birth: Date.new(User.minimum_required_age.years.ago.year, 12, 31))
-      expect(Verification::Management::Document.new.under_age?(census_response)).to be true
+      expect(described_class.new.under_age?(census_response)).to be true
     end
 
     it "returns false when the user is user's minimum required age" do
@@ -29,12 +29,12 @@ describe Verification::Management::Document do
                       User.minimum_required_age.years.ago.month,
                       User.minimum_required_age.years.ago.day)
       census_response = double(date_of_birth: date_of_birth)
-      expect(Verification::Management::Document.new.under_age?(census_response)).to be false
+      expect(described_class.new.under_age?(census_response)).to be false
     end
 
     it "returns false when the user is older than user's minimum required age" do
       census_response = double(date_of_birth: Date.new((User.minimum_required_age + 10).years.ago.year, 12, 31))
-      expect(Verification::Management::Document.new.under_age?(census_response)).to be false
+      expect(described_class.new.under_age?(census_response)).to be false
     end
   end
 end