(ITS#4396) doc update for synrepl

[richter@ecos.de]

Full_Name: Gerald Richter
Version: 2.3.19
OS: 
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (194.95.226.11)


To avoid confusion please add something like the following to the top of
slapo-syncprov.5:

All configuration regarding syncprov needs to be specified inside the database
definition that should be replicated. Loading or configuring syncprov before a
database definition will cause strange results.