Include animation.length in Animation example

The length of an Animation isn't automatically set by adding keys, and
it must be set manually. The existing example only has keys up to 0.5s,
so the default value of 1.0s may be acceptable. However, this results in
unexpected behavior for anyone who makes an animation longer than 1.0s.
Include animation.length in the example because it's important.

Also, increase the key position to 2.0s so it won't be confusing that
the assignment is somewhat redundant.

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