Update VideoPlayer.Source examples in docs to use remote image

[joshfarrant]

Summary

The video examples in the docs aren't currently working. For some reason the .mp4 isn't being served, so there's no video to play.

This PR switches the src of the video to use the static version in the Primer Brand repo.

What should reviewers focus on?

• Check that the video plays correctly in the deploy preview

Contributor checklist:

• All new and existing CI checks pass
• Tests prove that the feature works and covers both happy and unhappy paths
• Any drop in coverage, breaking changes or regressions have been documented above
• UI Changes contain new visual snapshots (generated by adding update snapshots label to the PR)
• All developer debugging and non-functional logging has been removed
• Related issues have been referenced in the PR description

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• Check that pull request and proposed changes adhere to our contribution guidelines and code of conduct
• Check that tests prove the feature works and covers both happy and unhappy paths
• Check that there aren't other open Pull Requests for the same update/change

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[rezrah]

In hindsight this feels a little risky for a number of reasons....

Could we instead link directly to the origin URL, which should fix the issue by not appending a trailing slash.

Suggested change

	<VideoPlayer.Source src="https://github.com/primer/brand/raw/refs/heads/main/apps/storybook/static/example.mp4" />
	<VideoPlayer.Source src="https://primer.github.io/brand/assets/example.mp4" />

[joshfarrant]

Oh cool, hadn't realised an absolute URL would fix it. Great suggestion, thanks!