fix pre round comment

Author: SakiTakamachi

ext/standard/math.c

@@ -138,7 +138,7 @@ PHPAPI double _php_math_round(double value, int places, int mode) {
 
 	/* If the decimal precision guaranteed by FP arithmetic is higher than
 	   the requested places BUT is small enough to make sure a non-zero value
-	   is returned, pre-round the result to the precision */
+	   is returned, adjust result digits to the precision */
 	if (precision_places > places && precision_places - 15 < places) {
 		int64_t use_precision = precision_places < INT_MIN+1 ? INT_MIN+1 : precision_places;