fix #2594: remove needless sandbox creation

Author: fatso83

docs/release-source/release/examples/spies-2-wrap-object-methods.test.js

@@ -16,14 +16,12 @@ const myExternalLibrary = {
 };
 
 describe("Wrap all object methods", function () {
-    const sandbox = sinon.createSandbox();
-
     beforeEach(function () {
-        sandbox.spy(myExternalLibrary);
+        sinon.spy(myExternalLibrary);
     });
 
     afterEach(function () {
-        sandbox.restore();
+        sinon.restore();
     });
 
     it("should inspect the external lib's usage of its internal methods", function () {

docs/release-source/release/examples/spies-3-wrap-existing-method.test.js

@@ -11,14 +11,12 @@ const jQuery = require("jquery")(window);
 global.document = document;
 
 describe("Wrap existing method", function () {
-    const sandbox = sinon.createSandbox();
-
     beforeEach(function () {
-        sandbox.spy(jQuery, "ajax");
+        sinon.spy(jQuery, "ajax");
     });
 
     afterEach(function () {
-        sandbox.restore();
+        sinon.restore();
     });
 
     it("should inspect jQuery.getJSON's usage of jQuery.ajax", function () {

docs/release-source/release/examples/spies-8-spy-call.test.js

@@ -11,14 +11,12 @@ const jQuery = require("jquery")(window);
 global.document = document;
 
 describe("Return nth call", function () {
-    const sandbox = sinon.createSandbox();
-
     beforeEach(function () {
-        sandbox.spy(jQuery, "ajax");
+        sinon.spy(jQuery, "ajax");
     });
 
     afterEach(function () {
-        sandbox.restore();
+        sinon.restore();
     });
 
     it("should inspect jQuery.getJSON's usage of jQuery.ajax", function () {