docs: update change detection strategy references

packages/core/src/change_detection/constants.ts

@@ -21,6 +21,8 @@ export enum ChangeDetectionStrategy {
    * until reactivated by setting the strategy to `Default` (`CheckAlways`).
    * Change detection can still be explicitly invoked.
    * This strategy applies to all child directives and cannot be overridden.
+   *
+   * NOTE: OnPush is enabled by default.
    */
   OnPush = 0,
 

packages/core/src/metadata/directives.ts

@@ -548,7 +548,9 @@ export interface Component extends Directive {
    * which is responsible for propagating the component's bindings.
    * The strategy is one of:
    * - `ChangeDetectionStrategy#OnPush` sets the strategy to `CheckOnce` (on demand).
-   * - `ChangeDetectionStrategy#Default` sets the strategy to `CheckAlways`.
+   * - `ChangeDetectionStrategy#Eager` sets the strategy to `CheckAlways`.
+   *
+   * NOTE: OnPush is enabled by default.
    */
   changeDetection?: ChangeDetectionStrategy;