The Spiderskin spell in Spell Compendium gives the target several bonus, each being a +1 every three caster levels, no cap, to a different number.
In the spell's text, there's a long sentence that says "This means A, B and C get +2 at level 6, +3 at level 9, +4 at level 12 and +5 at level 15."
It isn't the exact quote but the spirit is they give out the stats up to level 15 only, while the spell has no cap.
The limit at +5 is some sort of staple for at least one of the values the spell changes, which is an enhancement bonus to natural armor class, pre-epic.
In such a case, is it sufficient for the example not saying "and so on" to infer the cap, or is there any rule that says that the spell text takes precedence over the examples, the same ways text trumps tables?