pgsql: Fix documentation about size of interval type.

Fix documentation about size of interval type.

It's been 16 bytes, not 12, for ages. This was fixed in passing in HEAD
(commit 146604ec), but as a factual error it should have been back-patched.
Per gripe from Tatsuhito Kasahara.

Branch
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REL9_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/4f304875356bd92f5ed06fe751b985bbfd5b7d66

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

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