Description:
------------
mistakes in examples
en/reference/ingres-ii/functions/ingres-error.xml
en/reference/ingres-ii/functions/ingres-errsqlstate.xml


Reproduce code:
---------------
file: en/reference/ingres-ii/functions/ingres-error.xml
...
$error_text = ingres_error();
if ( is_null($error_text) ) {
   echo "An error occured - " . $error_text;
}
// ingres_error() return NULL if no error has occurred.
// function is_null() return TRUE if ingres_error() return NULL.
// 'if statement' is TRUE and print "An error occured - "
----------------------------------------
file: en/reference/ingres-ii/functions/ingres-errsqlstate.xml
...
$error_sqlstate = ingres_errsqlstate();
if ( is_null($error_sqlstate) ) {
   echo "An error occured - " . $error_sqlstate;
}
// ingres_errsqlstate() return NULL if no error SQLSTATE has occurred.
// function is_null() return TRUE if ingres_errsqlstate() return NULL.
// 'if statement' is TRUE and print "An error occured - "


Expected result:
----------------
file: en/reference/ingres-ii/functions/ingres-error.xml
...
$error_text = ingres_error();
if ( !is_null($error_text) ) {
   echo "An error occured - " . $error_text;
}
----------------------------------------
file: en/reference/ingres-ii/functions/ingres-errsqlstate.xml
...
$error_sqlstate = ingres_errsqlstate();
if ( !is_null($error_sqlstate) ) {
   echo "An error occured - " . $error_sqlstate;
}