shithub: puzzles

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ref: e2f4463c3e3c24783bb777e932587e3c266e3297
parent: 789e11f8f802889904c7eb137d354877f647c88d
author: Ben Harris <bjh21@bjh21.me.uk>
date: Tue Jan 31 17:27:16 EST 2023

Explicitly document that various function pointers can be NULL

There are various functions pointed to by the game structure that are
only called if certain flags are set.  Some of them were documented as
not being called when the flags were clear, but there was no explicit
statement that the pointers could simply be NULL in that case.  Now
there is.