Fix watch overload types

[Ovoda]

This PR fixes the watch() function documentation, which previously listed incorrect overloads.

Before

watch(name: string, defaultValue?): unknown
watch(names: string[], defaultValue?): {[key:string]: unknown}
watch(): {[key:string]: unknown}

After

watch(name: string, defaultValue?: unknown): unknown
watch(names: string[], defaultValue?: {[key:string]: unknown}): unknown[]
watch(): {[key:string]: unknown}

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