docs(gatsby-plugin-react-helmet): Remove broken Example link

[AchillesKal]

Description

The second link in the examples of the gatsby-plugin-react-helmet, does not work anymore, so I removed it.

[jaysella]

Good catch @AchillesKal - only removing a broken link.

It might be helpful if someone could find and add an additional example in the future now that there's only one listed.

[gatsbot]

Holy buckets, @AchillesKal — we just merged your PR to Gatsby! 💪💜

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Thanks again!

[sidharthachatterjee]

Thank you, @AchillesKal 👍