fix typos in guide

[davidcaron]

• {name: David} -> {name:David} (no space)
• reference to last example should be the third example ?

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[davidcaron]

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[dbieber]

Good catch on the last example. Should be either '{name: David}' or {name:David}.

The reference to the last example was as intended though. "name" and "David" are "bare-words", and are treated as strings (even though they don't have quotes around them) in the dict.

[davidcaron]

Got it, I reverted that change.