pgsql: docs: log_line_prefix session id fix

docs: log_line_prefix session id fix

Restore 4-byte designation for docs. Fix 9.3 doc query to properly pad
to four digits.

Backpatch to all active branches

Per suggestions from Ian Lawrence Barwick

Branch
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REL8_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/4fc423970c405edd8aecd393659b354719c2d1b4

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

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