message: docs: fix a small typo in injectable decorator description
  PR Close
diff: @@ -40,7 +40,7 @@ export interface InjectableDecorator {
  *
  * The following example shows how service classes are properly marked as
  * injectable.
  - *Z
  + *
  * <code-example path="core/di/ts/metadata_spec.ts" region="Injectable"></code-example>
  *
  */
  