Incorrect diagram for Example 8.7.16

[roconnor]

I don't know anything about CW complexes but I think the diagram should have the left hand arrow in the pushout being pr₁ : S₁ × 𝕊⁰ → S₁, and similarly for the second diagram.

[mikeshulman]

Hmm, yes, I think you're right. Would you like to submit a pull request?