update swift docs with pairing usage

[llbartekll]

[vercel[bot]]

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Name	Status	Preview	Updated
walletconnect-docs	✅ Ready (Inspect)	Visit Preview	Oct 18, 2022 at 0:18AM (UTC)

[chadyj]

@llbartekll

[ERROR] Error: Docusaurus found broken links! 17:15:15.081 |   17:15:15.081 | Please check the pages of your site in the list below, and make sure you don't reference any path that does not exist. 17:15:15.081 | Note: it's possible to ignore broken links with the 'onBrokenLinks' Docusaurus configuration, and let the build pass. 17:15:15.082 |   17:15:15.082 | Exhaustive list of all broken links found: 17:15:15.082 |   17:15:15.082 | - On source page path = /2.0/swift/auth/wallet-usage: 17:15:15.082 | -> linking to ../relay/usage#relay-client-configuration (resolved as: /2.0/swift/relay/usage) 17:15:15.082

[llbartekll]

hey, @chadyj I think it's fixed now.