[Edit] CSS: Animation

[mamtawardhani]

Type of Edit (select all that apply)

Fix grammar, spelling, formatting

Description (optional)

We would like to edit the Animation concept entry under CSS. The entry lives in docs/content/css/concepts/animations/terms/animation/animation.md

Please refer to the concept entry template, content standards and markdown style guide when working on the PR for this issue.

Please:

• Correct the typo on line 23, it says "where <value> can be and of the following keywords:". Change the "and" to "any"

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