Fix mistake in dynamic props doc
Fix mistake in dynamic props doc

Summary:
Fixing incorrect usage of [admonitions](https://docusaurus.io/docs/next/markdown-features/admonitions).  ~~:::Warning~~ -> :::caution

{F671302455}

Differential Revision: D31725965

fbshipit-source-id: 40fd50ecd437cf77dfe57a4a302dfd1914085780

facebook/litho,facebook/litho,facebook/litho,facebook/litho,facebook/litho,facebook/litho