Clarify the signals example slightly

Based on feedback in #402

examples/testing/main_test.go

@@ -66,3 +66,9 @@ func TestIntMinTableDriven(t *testing.T) {
 		})
 	}
 }
+
+func BenchmarkIntMin(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		IntMin(1, 2)
+	}
+}

examples/testing/testing.hash

@@ -1,2 +1,2 @@
-c9ca6b71d9f762b689f1f08a490d8c7f7764fcb3
-vY8PN0c6BSx
+25e8941d63b555a590e6d44a95ae0e41ecadadca
+ALL2BVLkYEr