Doc: typo fix, "PG_" should be "TG_" here.

Too much PG on the brain in commit 769159fd3, evidently.
Noted by [email protected].

Discussion: 
https://postgr.es/m/[email protected]

Branch
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REL9_6_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/eb63b72388b662039a886850257294d7d3f84f8f

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

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