Okay maybe my math sucks but when I calculate the diagonal distance between the corner of the small pad and the closest corner of the large pad using the datasheet it comes out to 0.25mm which is 0.00984252 inches which is smaller than the default DRC rule. In the DRC rules the custom settings start at 0.254mm or 0.010 inches. Professional shops will often go as low as 0.006 inches on their cheap 2 layer boards but be sure to check before changing the settings to match. You could also make the space a little larger or cut the corners off slightly without doing any major harm.