fix: eth page video graphic path

[saurabhburade]

Description

It fixes ethereum-hero-light.mp4 inappropriate path at What is ETH? page. Resolves [#13349]

Related Issue

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[corwintines]

Great! Thank you @saurabhburade

[corwintines]

@allcontributors can you add @saurabhburade for code

[allcontributors]

@corwintines

I've put up a pull request to add @saurabhburade! 🎉

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[wackerow]

Looks great, thanks @saurabhburade! Small house-keeping tip, in the future if you place Fixes #12345 (the issue number) in the PR message body, it will automatically be linked to the issue, and that issue will be closed automatically if/when the PR is merged. Thanks again!