description in redis.conf:
source code in server.c:
Comment From: oranagra
seems like the documentation is wrong, and also doesn't make much sense.
i.e. why would we reply that the sync is in progress in cases where it isn't (maybe there are network issues and we can't re-connect).
-MASTERDOWN seems right to me.
@eduardobr maybe you wanna make a PR to fix the docs?