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_3_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/64e381a163f04b89bc75721cd3a86d93be5fee68

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

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