Log Message:
-----------
Clarify STABLE function documentation to highlight how such functions
can be optimized.
Tags:
----
REL8_1_STABLE
Modified Files:
--------------
pgsql/doc/src/sgml:
xfunc.sgml (r1.107 -> r1.107.2.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/xfunc.sgml.diff?r1=1.107&r2=1.107.2.1)