Aligns docs on pages config with reality

[martypdx]

Changes

• What does this change?
  That the behavior of pages is relative to project root, not src

Testing

Manually tested in project

Docs

Aligns docs with how it currently works

[changeset-bot]

⚠️ No Changeset found

Latest commit: eb29b9b

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[netlify]

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[jonathantneal]

Perfect. Thank you for finding and fixing this, @martypdx.