Acceptable export values are:
both ---- the default, display the code and the results
code ---- display the code inside the block but do not process
results - process the block and replace it with the results of
execution
none ----- do not display either code or results upon export
from the description of litorgy-insert-result:
Insert RESULT into the current buffer after the end of the
current source block. With optional argument INSERT controls
insertion of results in the org-mode file. INSERT can take the
following values...
t ------ the default options, simply insert the results after the
source block
replace - insert results after the source block replacing any
previously inserted results
silent -- no results are inserted
