include information about connectToDevTools

[cabbagestone]

Adds information about the Apollo client development tools that can cause SSR to hang.

investigation stemming from this comment on this issue

Checklist:

• If this PR is a new feature, please reference a discussion where a consensus about the design
  was reached (not necessary for small changes)
• Make sure all the significant new logic is covered by tests

[changeset-bot]

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Latest commit: f6a5fb2

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