Lilly's Lasagna Leftovers: two small issues

[allaxandr]

Issue 1. This is a learning exercise, so it has an Introduction devoted to lambda lists. In the Optional Parameters section, there is a line

(optional-parameters 5 nil 10) ; => (5 DEFAULT (:Z-WAS-SUPPLIED 10))

In fact, it should be:

(optional-parameters 5 nil 10) ; => (5 NIL (:Z-WAS-SUPPLIED 10))

That is, nil value for a parameter is not the same as not supplying a value for the parameter.

Additionally, it's worth adding to the Introduction a note about how to correctly skip a default parameter (well, it must be a keyword parameter for us to be able to do that).

Issue 2. This exercise continues another learning exercise: Lilly's Lasagna. Lilly's Lasagna Leftovers is meant to re-implement some functions from Lilly's Lasagna in a more sophisticated way. The design in Lilly's Lasagna was: expected-time-in-oven defines total cooking time; remaining-minutes-in-oven subtracts from it elapsed-time-in-oven to produce its result. In Lilly's Lasagna Leftovers, the total cooking time is calculated in a more sophisticated way, but the function that is required to be rewritten is remaining-minutes-in-oven (which doesn't have an elapsed-time-in-oven parameter now).

Imo, the preferable way of fixing this issue is to rewrite expected-time-in-oven rather than remaining-minutes-in-oven. Regarding the latter, one small change can be: the parameter elapsed-time-in-oven should now have a default value of 0.

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