message: docs(animations): typo fix in the comments
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diff: @@ -13,7 +13,7 @@ import {AnimationPlayer} from './players/animation_player';
  * BrowserAnimationsModule BrowserAnimationsModule} or {@link NoopAnimationsModule
  * NoopAnimationsModule} modules are used within an application.
  *
  - * The purpose if this service is to produce an animation sequence programmatically within an
  + * The purpose of this service is to produce an animation sequence programmatically within an
  * angular component or directive.
  *
  * Programmatic animations are first built and then a player is created when the build animation is
  