docs: add inject dependencies section in module tests + improvements (#12993)

www/apps/book/sidebar.mjs

@@ -586,13 +586,6 @@ export const sidebars = [
             type: "link",
             path: "/learn/debugging-and-testing/testing-tools/modules-tests",
             title: "Modules Tests",
-            children: [
-              {
-                type: "link",
-                path: "/learn/debugging-and-testing/testing-tools/modules-tests/module-example",
-                title: "Example",
-              },
-            ],
           },
           {
             type: "link",