chore(docs): fix url for skipToken

[38elements]

Since the following url is wrong, this fixed it.

https://www.apollographql.com/docs/react/api/react/hooks/#skiptoken%60

[apollo-cla]

@38elements: Thank you for submitting a pull request! Before we can merge it, you'll need to sign the Apollo Contributor License Agreement here: https://contribute.apollographql.com/

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[phryneas]

Thank you!