doc: Fix incorrect reference to textout in plpgsql examples

This error has survived for 22 years, and has been introduced by
da63386.

Reported-by: Erwin Brandstetter
Discussion: 
https://postgr.es/m/caghenj57woggovgxo5lgwycqswxaflck8elqhdr+zrktpgs...@mail.gmail.com
Backpatch-through: 9.5

Branch
------
REL_11_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/d51155544befc48cacfda3ad28ba64bdee3161e8

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

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