the edit icon will only show if you are logged in, it does not show to anybody else viewing the site unless they are logged in to the PowerCMS Supper Admin account.
if you want to get rid of it altogether, just change the last parameter of the developer notes from false to true.
For example, my developer notes look like:
<?php
include('/Applications/MAMP/htdocs/pcms2_02/WA_CMS/addtosite.php');
echo WA_getCMSContent($database_PowerCMSConnection, $PowerCMSConnection, 'my new content', 'mid', false);
?>
by changing the false at the end to true, it hides the edit icon:
<?php
include('/Applications/MAMP/htdocs/pcms2_02/WA_CMS/addtosite.php');
echo WA_getCMSContent($database_PowerCMSConnection, $PowerCMSConnection, 'my new content', 'mid', true);
?>