pgsql: doc: fix log_line_prefix session_id %c item

doc: fix log_line_prefix session_id %c item

Backpatch to 9.1 and earlier

Report from Ian Lawrence Barwick

Branch
------
REL9_1_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/8f80e35b55b83debc4cd08ec27510c05e08e2496

Modified Files
--------------
doc/src/sgml/config.sgml | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

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