ch07 notebook: code fix + typo - #158

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ArnaudBrousseau wants to merge 2 commits into

jimmysong:masterfrom

ArnaudBrousseau:code_ch07_typo_fix

Commits on Aug 2, 2019

Fixes a couple typos in ch07 code
ArnaudBrousseau
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3982859
Switch second cell's parsing to target testnet. Fixes a 404/crash on cell execution.
ArnaudBrousseau
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3edaddd