plscheme - htdocs: Mention about optional "count" argument of

Log Message:
-----------
Mention about optional "count" argument of spi-execute and spi-execute-prepared
methods.

Modified Files:
--------------
htdocs:
index.html (r1.10 -> r1.11)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plscheme/htdocs/index.html.diff?r1=1.10&r2=1.11)