pgsql: docs: fix typo in rules.sgml

docs: fix typo in rules.sgml

Report by Dean Rasheed

Patch by Dean Rasheed

Backpatch through 9.5

Branch
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REL9_5_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/5e0cef8a667746d4abaec16f395b150f46493d80

Modified Files
--------------
doc/src/sgml/rules.sgml | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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