Adjust documentation for syncfs().
Commit
8c16ad3b43 created a new appendix for syncfs(), which is
excessive for such a small amount of content. This commit moves
the description of the caveats to be aware of when using syncfs()
back to the documentation for recovery_init_sync_method. The
documentation for the other utilities with syncfs() support now
directs readers to recovery_init_sync_method for information about
these caveats.
Reported-by: Peter Eisentraut, Robert Haas
Suggested-by: Robert Haas
Reviewed-by: Robert Haas
Discussion: https://postgr.es/m/
42804669-7063-1320-ed37-
3226d5f1067d%40eisentraut.org
Discussion: https://postgr.es/m/CA%2BTgmobUiqKr%2BZMCLc5Qap-sXBnjfGUU%2BZBmzYEjUuWyjsGr1g%40mail.gmail.com