chore: update cheatsheet for new provider syntax (#9227)

modules/@angular/docs/cheatsheet/bootstrapping.md

@@ -8,11 +8,11 @@ Bootstrapping
 
 @cheatsheetItem
 syntax(ts dart):
-`bootstrap​(MyAppComponent, [MyService, provide(...)]);`|`provide`
+`bootstrap​(MyAppComponent, [MyService, { provide: ... }]);`|`provide`
 syntax(js):
 `document.addEventListener('DOMContentLoaded', function () {
   ng.platform.browser.bootstrap(MyAppComponent,
-    [MyService, ng.core.provide(...)]);
+    [MyService, { provide: ... }]);
 });`|`provide`
 description:
 Bootstraps an application with MyAppComponent as the root component and configures the DI providers. {@target js}Must be wrapped in the event listener to fire when the page loads.{@endtarget}