docs: replaced the map with the forEach (#27244)

(cherry picked from commit 5c3cbb6)

integration/harness-e2e-cli/src/test.ts

@@ -24,4 +24,4 @@ getTestBed().initTestEnvironment(BrowserDynamicTestingModule, platformBrowserDyn
 // Then we find all the tests.
 const context = require.context('./', true, /\.spec\.ts$/);
 // And load the modules.
-context.keys().map(context);
+context.keys().forEach(context);