pgsql: Document that PL/Python now returns floats using repr() not str(

Document that PL/Python now returns floats using repr() not str().

Commit 1ce7a57ca neglected to update the user-facing documentation,
which described the old behavior precisely.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/075ab425bdbb4bb2de41624305f20885cae7ba7e

Modified Files
--------------
doc/src/sgml/plpython.sgml | 24 ++++++++++++++----------
1 file changed, 14 insertions(+), 10 deletions(-)

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