docs(core): fix tree-shakable spelling (#24057)

PR Close #24057

packages/core/src/di/injection_token.ts

@@ -38,18 +38,14 @@ import {defineInjectable} from './defs';
  *
  * @usageNotes
  * ### Basic Example
-
- * #### Tree-shakable InjectionToken
- *
- * {@example core/di/ts/injector_spec.ts region='ShakeableInjectionToken'}
  *
  * #### Plain InjectionToken
  *
  * {@example core/di/ts/injector_spec.ts region='InjectionToken'}
  *
- * ### Tree-shakeable Example
+ * #### Tree-shakable InjectionToken
  *
- * {@example core/di/ts/injector_spec.ts region='ShakeableInjectionToken'}
+ * {@example core/di/ts/injector_spec.ts region='ShakableInjectionToken'}
  *
  */
 export class InjectionToken<T> {

packages/examples/core/di/ts/injector_spec.ts

@@ -61,7 +61,7 @@ class MockRootScopeInjector implements Injector {
       const injector =
           new MockRootScopeInjector(Injector.create({providers: [{provide: MyDep, deps: []}]}));
 
-      // #docregion ShakeableInjectionToken
+      // #docregion ShakableInjectionToken
       class MyService {
         constructor(readonly myDep: MyDep) {}
       }