Match Rspec terminology

spec/lib/msf/core/exploit/browser/server_spec.rb

@@ -11,16 +11,16 @@ describe Msf::Exploit::Remote::BrowserExploitServer do
     mod
   end
 
-  let(:mock_service) do
-    mock_service = double("service")
-    mock_service.stub(:server_name=)
-    mock_service.stub(:add_resource)
+  let(:service_double) do
+    service = double("service")
+    service.stub(:server_name=)
+    service.stub(:add_resource)
 
-    mock_service
+    service
   end
 
   before do
-    Rex::ServiceManager.stub(:start => mock_service)
+    Rex::ServiceManager.stub(:start => service_double)
   end
 
   describe ".get_module_resource" do