log_connections and log_disconnections

Hi,

The GucContext of log_connections and log_disconnections is PGC_BACKEND.
So, in the document, we should use the following expressions

        This parameter cannot be changed after session start.

instead of

        This parameter can only be set in the postgresql.conf file or
on the server command line.

for them? The former is used also for other PGC_BACKEND
parameters (e.g., post_auth_delay). I attached the patch.

Regards,

--
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center