Update json_encode.rst

a more-useful description of the "options" argument >_>
merged branch ThatGuyBen/patch-1 (PR #1048)

This PR was merged into the master branch.

Discussion
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Update json_encode.rst

a more-useful description of the "options" argument >_>

Commits
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742043f Update json_encode.rst
tweaked previous merge
Fixed twig filesystemloader security issue + test (closes #1026)
updated CHANGELOG for previous commit
prepared the 1.12.2 release
bumped version to 1.12.4-DEV