Обсуждение: pgsql: pg_stat_activity: document client_port being null

pg_stat_activity: document client_port being null

As suggested by Stephen Frost.
Discussion: https://postgr.es/m/20191104160605.GC6962@tamriel.snowman.net

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/c5e8ea978d88ea4aa731516836e14d54c50cc957

Modified Files
--------------
doc/src/sgml/monitoring.sgml | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)