random: Extend the comment about FIPS specifics
* random/rndgetentropy.c (_gcry_rndgetentropy_gather_random): Clarify description of the chainging DRBG in FIPS mode.
Cherry-picked master commit of:
6e832840a8b7cdd30f77e66685ad0de863d7e84d
- Signed-off-by: Jakub Jelen <jjelen@redhat.com>