Added note about arrays

[franciscop]

Added note about arrays being returned as JSON.

[codecov]

Codecov Report

Merging #964 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #964   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           4      4           
  Lines         431    431           
  Branches      103    103           
=====================================
  Hits          431    431

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[fl0w]

This occurs because of the resent header parser change in core if I'm not mistaken, correct?

[franciscop]

@fl0w I am sorry I got some trouble understanding the English in that sentence, could you rephrase it please? What header parser change in core? (is that something that happened in Koa? or something I don't understand?)

If it makes it any more clear, I wrote an issue here that explains why it happens: #965