Adds documentation about the system header and footer

ee/spec/helpers/ee/appearances_helper_spec.rb

@@ -3,7 +3,7 @@ require 'spec_helper'
 describe AppearancesHelper do
   describe '#header_message' do
     it 'returns nil when header message field is not set' do
-      appearance = create(:appearance)
+      create(:appearance)
 
       expect(helper.header_message).to be_nil
     end
@@ -11,7 +11,7 @@ describe AppearancesHelper do
     context 'when header message is set' do
       it 'includes current message' do
         message = "Foo bar"
-        appearance = create(:appearance, header_message: message)
+        create(:appearance, header_message: message)
 
         expect(helper.header_message).to include(message)
       end
@@ -20,7 +20,7 @@ describe AppearancesHelper do
 
   describe '#footer_message' do
     it 'returns nil when footer message field is not set' do
-      appearance = create(:appearance)
+      create(:appearance)
 
       expect(helper.footer_message).to be_nil
     end
@@ -28,7 +28,7 @@ describe AppearancesHelper do
     context 'when footer message is set' do
       it 'includes current message' do
         message = "Foo bar"
-        appearance = create(:appearance, footer_message: message)
+        create(:appearance, footer_message: message)
 
         expect(helper.footer_message).to include(message)
       end