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Substitution example: removed hedging, added links
I revised the text after realizing that there actually are keys `:field` and (in Vega-Lite) `"field"`. I thought `:field` might just be a dummy variable for the sake of an example. I also added links to Hanami source and a Vega-Lite doc page. Maybe it's inappropriate to include these links in a section that's intended to give an overview. However, part of what's confusing is all of the layers involved (:X is value of :field, but it's a key to look up "x", which will be a default value for "field"). One doesn't have to follow the links, but maybe having the exact references available will help some readers to sort out the layers. Fixed typos created when fixing typos
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