Fixed typo on page photos-and-videos

[theBstar]

Fixed a typo on the documentation page photos-and-videos

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Motivation (required)

The PR fixes a typo on photos-and-videos page.

Test Plan (required)

No code changes here. However, I have run a preview of the file.
The current doc says You can also combine these techniques to create a video in the runtime, and layer play it from your React application. where it should be You can also combine these techniques to create a video in the runtime, and later play it from your React application.