pg_stat_activity: document client_port being null

As suggested by Stephen Frost.
Discussion: https://postgr.es/m/[email protected]

Branch
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master

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

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

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