Intent to close ISSUE-212

The description of the two flatten tests 0027 and 0038 was misleading and
has been fixed. Furthermore, the node map generation algorithm has been made
clearer. Unless I hear objections, I will proceed and close ISSUE-212 [1] in
24 hours.


[1] https://github.com/json-ld/json-ld.org/issues/212


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Markus Lanthaler
@markuslanthaler