Update 09.1-animation.md

Add note about ReactTransitionGroup, that any additional, user-defined, properties will be become properties of the rendered component.
And example how to render a `<ul>` with css class.
Fix JSDoc tag in ReactElement.js
Merge pull request #2381 from shripadk/jsdoc-fix

Fix JSDoc tag in ReactElement.js
Merge pull request #2373 from genbit/docs-animation-props

Update 09.1-animation.md