fix features

features/built_in_matchers/satisfy.feature

@@ -59,16 +59,11 @@ Feature: `satisfy` matcher
     Given a file named "satisfy_matcher_returned_value_spec.rb" with:
       """ruby
       RSpec.describe "double-purpose" do
-        def action!(ary, entry)
-          ary.push(entry)
-          ary.sum
-        end
-
         it "adds an entry and returns the sum" do
-          ary = [1]
-          expect { action!(ary, 3) }
-            .to change { ary }.to([1, 3])
-            .and satisfy { |returned_value| returned_value == 4 }
+          ary = [1, 2, 3]
+          expect { ary.shift }
+            .to change { ary }.to([2, 3])
+            .and satisfy { |returned_value| returned_value == 1 }
         end
       end
       """