fix(docs): update url for fastify

[achinchen]

Current Behavior

Attach fastify legacy document url www.fastify.io

Expected Behavior

With latest fastify document url www.fastify.dev

Related Issue(s)

Fixes #17668

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 18, 2023 0:51am

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✅ Successfully ran 8 targets

• nx affected -t e2e-macos --parallel=1 --base=1fda800b332af491e14f2d5d213d63af952405aa --head=399eae3bbd43648fef0245a3ac7c907e389a4843
• nx affected --target=e2e --base=1fda800b332af491e14f2d5d213d63af952405aa --head=399eae3bbd43648fef0245a3ac7c907e389a4843 --parallel=1
• nx affected --target=build --base=1fda800b332af491e14f2d5d213d63af952405aa --head=399eae3bbd43648fef0245a3ac7c907e389a4843 --parallel=3
• nx run-many -t check-imports check-commit check-lock-files depcheck check-codeowners documentation --parallel=1 --no-dte
• nx affected --target=test --base=1fda800b332af491e14f2d5d213d63af952405aa --head=399eae3bbd43648fef0245a3ac7c907e389a4843 --parallel=1
• nx affected --target=lint --base=1fda800b332af491e14f2d5d213d63af952405aa --head=399eae3bbd43648fef0245a3ac7c907e389a4843 --parallel=3
• nx-cloud record -- nx format:check --base=1fda800b332af491e14f2d5d213d63af952405aa --head=399eae3bbd43648fef0245a3ac7c907e389a4843
• nx documentation --no-dte

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Sent with 💌 from NxCloud.

[jaysoo]

Thank you!

[github-actions]

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