message: docs(animations): express the seconds in numbers
  I've noticed that the seconds are expressed both by using numbers and words.
  For example, the doc says `0.5 second` and not `half second`.
  I believe is more readable to express them by using numbers and is consistent too.
  PR Close
diff: @@ -138,15 +138,15 @@ The third argument, `easing`, controls how the animation [accelerates and decele
  **Note:** See the Material Design website's topic on [Natural easing curves](https://material.io/design/motion/speed.html#easing) for general information on easing curves.
  </div>
  -This example provides a state transition from `open` to `closed` with a one second transition between states.
  +This example provides a state transition from `open` to `closed` with a 1-second transition between states.
  <code-example path="animations/src/app/open-close.component.ts" header="src/app/open-close.component.ts" language="typescript"
  region="transition1">
  </code-example>
  -In the preceding code snippet, the `=>` operator indicates unidirectional transitions, and `<=>` is bidirectional. Within the transition, `animate()` specifies how long the transition takes. In this case, the state change from `open` to `closed` takes one second, expressed here as `1s`.
  +In the preceding code snippet, the `=>` operator indicates unidirectional transitions, and `<=>` is bidirectional. Within the transition, `animate()` specifies how long the transition takes. In this case, the state change from `open` to `closed` takes 1 second, expressed here as `1s`.
  -This example adds a state transition from the `closed` state to the `open` state with a 0.5 second transition animation arc.
  +This example adds a state transition from the `closed` state to the `open` state with a 0.5-second transition animation arc.
  <code-example path="animations/src/app/open-close.component.ts" header="src/app/open-close.component.ts" language="typescript"
  region="transition2">
  