docs: Fix config option example typo in tooltip

[LeggoTM]

• Closes Wrong spelling for viewportWidth configuration option example in defineConfig() tooltip in VSCode #28173

Additional details

Fix typo of viewportWith: 400 to viewportWidth: 400 in the cypress-npm-api.d.ts file.

Steps to test

• Create a new cypress project
• Open cypress.config,js file in VSCode
• Hover over the defineConfig() function

How has the user experience changed?

PR Tasks

• [na] Have tests been added/updated?
• [na] Has a PR for user-facing changes been opened in cypress-documentation?
• [na] Have API changes been updated in the type definitions?

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[cypress-bot]

Released in 13.5.0.

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