doc: Fix example with __next__() in PL/Python function
Per PEP 3114, iterator.next() has been renamed to iterator.__next__(),
and one example in the documentation still used next(). This caused the
example provided to fail the function creation since Python 2 is not
supported anymore since 19252e8ec93.
Author: Erik Wienhold
Discussion: https://postgr.es/m/173209043143.2092749.13692266486972491694@wrigleys.postgresql.org
Backpatch-through: 15
Branch
------
REL_17_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/1a52069914ebf81ab8591f5b451fc9099529c211
Modified Files
--------------
doc/src/sgml/plpython.sgml | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
