doc: correct crypto encoding information
Checklist
-
make -j4 test
(UNIX), orvcbuild test nosign
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
doc
Description of change
The default encoding for crypto methods was changed in v6.0.0, with v4.x keeping a default of binary.
Ref: https://github.com/nodejs/node/commit/b010c8716498dca398e61c388859fea92296feb3