src: add comment for TicketKeyCallback
Fixes: https://github.com/nodejs/node/issues/13176
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
src/crypto
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Fixes: https://github.com/nodejs/node/issues/13176
make -j4 test
(UNIX), or vcbuild test
(Windows) passessrc/crypto