docs: clarify plpython SD and GD dictionary behavior

Reported-by: Adam Bielański
Discussion: https://postgr.es/m/153484305538.1370.7605856225879294548@wrigleys.postgresql.org

Backpatch-through: 9.3

diff --git a/doc/src/sgml/plpython.sgml b/doc/src/sgml/plpython.sgml
index 777a7ef780f9aa986606e9497403b6f9d43168ca..c84e93a8f89fd3b2b31601c28ba244fc3ef384e3 100644 (file)
--- a/doc/src/sgml/plpython.sgml
+++ b/doc/src/sgml/plpython.sgml
@@ -753,9 +753,9 @@ SELECT * FROM multiout_simple_setof(3);
   Sharing Data
   
    The global dictionary SD is available to store
-   data between function calls.  This variable is private static data.
+   private data between repeated calls to the same function.
    The global dictionary GD is public data,
-   available to all Python functions within a session.  Use with
+   that is available to all Python functions within a session;  use with
    care.global data
    in PL/Python