pgsql: docs: fix log_line_prefix session id docs

docs: fix log_line_prefix session id docs

Backpatch to 9.2.

Report from Ian Lawrence Barwick

Branch
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REL9_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/4aea429050289c2707bd8f1f63344569791645bd

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

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