Lines 4322-4323: made links HTML tags instead of markdown in the definitions I added for JSON and property.
Line 4324: added booleans and numbers back into the Data Structures and overall reduced number of words used in explanations.
Lines 4338 and 4343: removed quotes from integer value and boolean value because the JSON is valid without them.
Line 4502: specified what part of property the ID number is to reinforce that a property consists of a key (or name) and a value.
Lines 4505-4508: reworded the conditions to be more consistent and comprehensible, changed their order.
Line 4510: retitled Note to Hints and added two more hints.
Line 4543: changed from my first PR's suggestion of var collectionCopy = JSON.stringify(collection) back to var collectionCopy = JSON.parse(JSON.stringify(collection)).
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