Update Product Analytics SDK instructions to use correct values

What does this MR do and why?

Currently we're displaying incorrect information as part of our Product Analytics onboarding flow:

• We show the configurator URL instead of the collector. We missed this because in our devkit, the configurator and collector are running on the same image/service
• We show the Jitsu project ID as the API key. This is incorrect, as the project ID is necessary in the setup process to create an API key and destination to collect events, but we should be returning the API key to the user, as that's the identifier they use when sending events to the collector

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